VegeWorx Plant Index - Letter N
- Na Pali Rockwort - Nototrichium Divaricatum D.H. Lorence
- Na Pali Sandmat - Chamaesyce Eleanoriae D.H. Lorence & W.L. Wagner
- Na Pali-kona Woodfern - Dryopteris Tenebrosa W.H. Wagner
- Na'ena'e 'ula - Dubautia Raillardioides Hillebr.
- Na'ena'e Pua Kea - Dubautia Paleata A. Gray
- Na'ena'e Pua Melemele - Dubautia Laxa Hook. & Arn.
- Na'ena'e Pua Melemele - Dubautia Laxa Hook. & Arn. ssp. bryanii (O. Deg. & Sherff) G.D. Carr
- Na'ena'e Pua Melemele - Dubautia Laxa Hook. & Arn. ssp. hirsuta (Hillebr.) G.D. Carr
- Na'ena'e Pua Melemele - Dubautia Laxa Hook. & Arn. ssp. laxa
- Na'ena'e Pua Melemele - Dubautia Laxa Hook. & Arn. ssp. pseudoplantaginea (Skottsb.) G.D. Carr
- Nabalus Albus (L.) Hook.
- Nabalus Altissimus (L.) Hook.
- Nabalus Asperus (Michx.) Torr. & A. Gray
- Nabalus Autumnalis (Walter) Weakley
- Nabalus Boottii DC.
- Nabalus Crepidineus (Michx.) DC.
- Nabalus Cylindricus Small
- Nabalus Integrifolius Cass.
- Nabalus Nanus (Bigelow) DC.
- Nabalus Racemosus (Michx.) DC.
- Nabalus Roanensis Chickering
- Nabalus Serpentarius (Pursh) Hook.
- Nabalus Trifoliolatus Cass.
- Nabalus Virgatus (Michx.) DC.
- Nadvornik's Horsehair Lichen - Bryoria Nadvornikiana (Gyel.) Brodo & D. Hawksw.
- Nadvornikia - Nadvornikia Tibell
- Nadvornikia Sorediata R.C. Harris
- Nageia Coriacea (Rich.) Kuntze
- Nail Lichen - Pilophorus Acicularis (Ach.) Th. Fr.
- Nail Lichen - Pilophorus Cereolus (Ach.) Th. Fr.
- Nail Lichen - Pilophorus Clavatus Th. Fr.
- Nail Lichen - Pilophorus Fibula (Tuck.) Th. Fr.
- Nail Lichen - Pilophorus Nigricaulis Sato
- Nail Lichen - Pilophorus Th. Fr.
- Nail Lichen - Pilophorus Vegae Krog
- Nailwort - Paronychia Mill.
- Naio - Myoporum Sandwicense (A. DC.) A. Gray
- Najas Ancistrocarpa auct. non Magnus
- Najas Arguta Kunth var. conferta A. Braun
- Najas Caespitosa (Maguire) Reveal
- Najas Conferta (A. Braun) A. Braun
- Najas Flexilis (Willd.) Rostk. & Schmidt ssp. caespitosa Maguire
- Najas Flexilis (Willd.) Rostk. & Schmidt var. congesta Farw.
- Najas Flexilis (Willd.) Rostk. & Schmidt var. robusta Morong
- Najas Gracilis (Morong) Small
- Najas Guadalupensis (Spreng.) Magnus var. floridana Haynes & Wentz
- Najas Guadalupensis (Spreng.) Magnus var. muenscheri (R.T. Clausen) Haynes
- Najas Guadalupensis (Spreng.) Magnus var. olivacea (Rosend. & Butters) Haynes
- Najas Indica (Willd.) Cham. var. gracillima A. Braun ex Engelm.
- Najas Major All.
- Najas Major All. var. angustifolia A. Braun ex K. Schum.
- Najas Marina L. var. recurvata Dudley
- Najas Muenscheri R.T. Clausen
- Najas Olivacea Rosend. & Butters
- Najas Wrightiana A. Braun ssp. multidentata (W. Koch) R.T. Clausen
- Naked Albizia - Albizia Carbonaria Britton
- Naked Buckwheat - Eriogonum Nudum Douglas ex Benth.
- Naked Buckwheat - Eriogonum Nudum Douglas ex Benth. var. auriculatum (Benth.) Tracy ex Jeps.
- Naked Buckwheat - Eriogonum Nudum Douglas ex Benth. var. deductum (Greene) Jeps.
- Naked Buckwheat - Eriogonum Nudum Douglas ex Benth. var. nudum
- Naked Buckwheat - Eriogonum Nudum Douglas ex Benth. var. oblongifolium S. Watson
- Naked Buckwheat - Eriogonum Nudum Douglas ex Benth. var. pauciflorum S. Watson
- Naked Buckwheat - Eriogonum Nudum Douglas ex Benth. var. pubiflorum Benth.
- Naked Buckwheat - Eriogonum Nudum Douglas ex Benth. var. scapigerum (Eastw.) Jeps.
- Naked Catchfly - Silene Aperta Greene
- Naked Crabgrass - Digitaria Nuda Schumach.
- Naked Lipfern - Cheilanthes Nudiuscula (R. Br.) T. Moore
- Naked Mariposa Lily - Calochortus Nudus S. Watson
- Naked Mexicanhat - Ratibida Peduncularis (Torr. & A. Gray) Barnhart
- Naked Mexicanhat - Ratibida Peduncularis (Torr. & A. Gray) Barnhart var. peduncularis
- Naked Mexicanhat - Ratibida Peduncularis (Torr. & A. Gray) Barnhart var. picta (A. Gray) Sharp
- Naked Milkvetch - Astragalus Serenoi (Kuntze) Sheldon
- Naked Milkvetch - Astragalus Serenoi (Kuntze) Sheldon var. serenoi
- Naked Milkvetch - Astragalus Serenoi (Kuntze) Sheldon var. sordescens Barneby
- Naked Miterwort - Mitella Nuda L.
- Naked Oat - Avena Nuda L. [excluded]
- Naked Rhizomnium Moss - Rhizomnium Nudum (E. Britton & R.S. Williams) T. Kop.
- Naked Sedge - Carex Nudata W. Boott
- Naked Turtleback - Psathyrotopsis Scaposa (A. Gray) H. Rob.
- Nakedflower Ticktrefoil - Desmodium Nudiflorum (L.) DC.
- Nakedstem Alkaliweed - Cressa Nudicaulis Griseb.
- Nakedstem Carpetweed - Mollugo Nudicaulis Lam.
- Nakedstem Carpetweed - Mollugo Nudicaulis Lam. var. nudicaulis
- Nakedstem Dewflower - Murdannia Nudiflora (L.) Brenan
- Nakedstem Gymnosteris - Gymnosteris Nudicaulis (Hook. & Arn.) Greene
- Nakedstem Hawksbeard - Crepis Pleurocarpa A. Gray
- Nakedstem Livingvase - Aechmea Nudicaulis (L.) Griseb.
- Nakedstem Phacelia - Phacelia Gymnoclada Torr. ex S. Watson
- Nakedstem Saxifrage - Saxifraga Nudicaulis D. Don
- Nakedstem Sunray - Enceliopsis Nudicaulis (A. Gray) A. Nelson
- Nakedstem Sunray - Enceliopsis Nudicaulis (A. Gray) A. Nelson var. corrugata Cronquist
- Nakedstem Sunray - Enceliopsis Nudicaulis (A. Gray) A. Nelson var. nudicaulis
- Nakedstem Wallflower - Parrya Nudicaulis (L.) Regel
- Nakedwood - Colubrina Rich. ex Brongn.
- Nalta Jute - Corchorus Olitorius L.
- Nama Affinis (A. Gray) Kuntze
- Nama Corymbosa (J. Macbr. ex Elliott) Kuntze
- Nama Demissum A. Gray var. deserti Brand
- Nama Dichotomum (Ruiz & Pav.) Choisy var. dichotomum
- Nama Foliosum (Wooton & Standl.) Tidestr.
- Nama Hispidum A. Gray var. mentzelii Brand
- Nama Hispidum A. Gray var. revolutum Jeps.
- Nama Hispidum A. Gray var. spathulatum (Torr.) C.L. Hitchc.
- Nama Macranthum (Choisy) Brand [excluded]
- Nama Ovata (Nutt. ex Choisy) Britton
- Nama Parryi A. Gray
- Nama Quadrivalvis (Walter) Kuntze
- Nama Sandwicense A. Gray var. laysanicum Brand
- Nama Stenophyllum A. Gray ex Hemsl. var. egenum J.F. Macbr.
- Nama Tenue (Wooton & Standl.) Tidestr.
- Nandina - Nandina Thunb.
- Nanking Cherry - Prunus Tomentosa Thunb.
- Nannyberry - Viburnum Lentago L.
- Nanomitrium Austinii (Sull.) Lindb.
- Nanomitrium Austinii (Sull.) Lindb. var. floridanum Grout
- Nanomitrium Megalosporum (Austin) E. Britton
- Nanomitrium Synoicum (James) Lindb.
- Nanomitrium Tenerum (Bruch & Schimp.) Lindb.
- Nanomitrium Wrightii (Müll. Hal.) L.E. Anderson & Bryan
- Nanostictis M.s. Christ.
- Nanostictis Pseudocyphellariae Sherwood
- Nanozostera Americana (Hartog) P.S. Toml. & U. Posl.
- Nantucket Blackberry - Rubus Bicknellii L.H. Bailey
- Nantucket Serviceberry - Amelanchier Nantucketensis E.P. Bicknell
- Napa Biscuitroot - Lomatium Repostum (Jeps.) Mathias
- Napa Bluecurls - Trichostema Ruygtii F.H. Lewis
- Napa Bluegrass - Poa Napensis Beetle
- Napa Cryptantha - Cryptantha Hispidula Greene ex Brand
- Napa False Indigo - Amorpha Californica Nutt. var. napensis Jeps.
- Napa Milkvetch - Astragalus Clarianus Jeps.
- Napaea Hermaphrodita L.
- Napaea - Napaea L.
- Napali Beach Starviolet - Hedyotis St.-johnii B.C. Stone & M.A. Lane
- Napali Coast Labordia - Labordia Helleri Sherff
- Napali Coast Papala - Charpentiera Densiflora Sohmer
- Napali Kona Peperomia - Peperomia Kokeana Yunck.
- Napkinring - Eriogonum Intrafractum Coville & Morton
- Napoleon's Plume - Bauhinia Monandra Kurz
- Naranjilla - Solanum Quitoense Lam.
- Narciso Colorado - Renealmia Jamaicensis (Gaertn.) Horan.
- Narciso Colorado - Renealmia Jamaicensis (Gaertn.) Horan. var. puberula (Gagnep.) Maas
- Narcissus Anemone - Anemone Narcissiflora L.
- Narcissus Anemone - Anemone Narcissiflora L. var. monantha DC.
- Narcissus Anemone - Anemone Narcissiflora L. var. villosissima DC.
- Narcissus Anemone - Anemone Narcissiflora L. var. zephyra (A. Nelson) Dutton & Keener
- Narcissus Barrii hort. ex Brub. p.p.
- Narcissus Biflorus W. Curtis
- Narcissus Juncifolius auct. non Lag.
- Narcissus Poetaz hort. ex L.H. Bailey
- Nardia A. Gray, nom. cons.
- Nardia Breidleri (Limpr.) Lindb.
- Nardia Compressa (Hook.) A. Gray
- Nardia Geoscyphus (De Not.) Lindb.
- Nardia Geoscyphus (De Not.) Lindb. var. bifida R.M. Schust.
- Nardia Geoscyphus (De Not.) Lindb. var. geoscyphus
- Nardia Insecta Lindb.
- Nardia Japonica Steph.
- Nardia Lescurii (Austin) Underw.
- Nardia Scalaris A. Gray
- Nardia Scalaris A. Gray ssp. botryoidea R.M. Schust.
- Nardia Scalaris A. Gray ssp. scalaris
- Nardoo - Marsilea Crenata C. Presl
- Nardoo - Marsilea Drummondii A. Braun
- Nardosmia Arctica (A.E. Porsild) Á. Löve & D. Löve
- Nardosmia Japonica Siebold & Zucc.
- Nardosmia Vitifolia (Greene) Á. Löve & D. Löve
- Nardurus Maritimus (L.) Murb.
- Nardus Ciliaris L.
- Narihira Bamboo - Semiarundinaria Fastuosa (Lat.-Marl. ex Mitford) Makino ex Nakai
- Narrow Alkaligrass - Puccinellia Angustata (R. Br.) Rand & Redf.
- Narrow Corncockle - Agrostemma Brachyloba (Fenzl) Hammer
- Narrow Haresfoot Fern - Davallia Angustata Wall. ex Hook. & Grev.
- Narrow Helmet Orchid - Cranichis Tenuis Rchb. f. [excluded]
- Narrow Lineleaf Fern - Antrophyum Lineatum (Sw.) Kaulf.
- Narrow Phacelia - Phacelia Filiformis Brand
- Narrow Pipewort - Eriocaulon Lineare Small
- Narrow Plumegrass - Saccharum Baldwinii Spreng.
- Narrow Strapfern - Campyloneurum Angustifolium (Sw.) Fée
- Narrow Swordfern - Nephrolepis Cordifolia (L.) C. Presl
- Narrow-leaf Bottlebrush - Callistemon Linearis (Schrad. & J.C. Wendl.) Sweet
- Narrow-leaf Hopbush - Dodonaea Viscosa (L.) Jacq. ssp. angustissima (DC.) J.G. West
- Narrow-leaf Peppermint Gum - Eucalyptus Radiata Sieber ex DC.
- Narrow-leaf Peppermint Gum - Eucalyptus Robertsonii Blakely
- Narrow-leaf Wattle - Acacia Mucronata Willd. ex H.L. Wendl.
- Narrow-leaf-box - Eucalyptus Pilligaensis Maiden
- Narrow-leaved Blazingstar - Mentzelia Linearifolia N.D. Atwood & S.L. Welsh
- Narrow-leaved Iceplant - Conicosia N.r. Br.
- Narrow-leaved Iceplant - Conicosia Pugioniformis (L.) N.E. Br.
- Narrow-leaved Rockdaisy - Perityle Angustifolia (A. Gray) Shinners
- Narrow-petal Rein Orchid - Piperia Leptopetala Rydb.
- Narrow-wing Water-starwort - Callitriche Stenoptera Lansdown
- Narrowcell Cornsalad - Valerianella Stenocarpa (Engelm. ex A. Gray) Krok
- Narrowflower Flaxflower - Leptosiphon Liniflorus (Benth.) J.M. Porter & L.A. Johnson
- Narrowflower Lupine - Lupinus Angustiflorus Eastw.
- Narrowfruit Braya - Braya Linearis Rouy
- Narrowfruit Cornsalad - Valerianella Dentata (L.) Pollich
- Narrowfruit Horned Beaksedge - Rhynchospora Inundata (Oakes) Fernald
- Narrowfruit Sedge - Carex Specifica L.H. Bailey
- Narrowleaf Airplant - Tillandsia Tenuifolia L.
- Narrowleaf Angelon - Angelonia Angustifolia Benth.
- Narrowleaf Arnica - Arnica Angustifolia Vahl
- Narrowleaf Arnica - Arnica Angustifolia Vahl ssp. angustifolia
- Narrowleaf Arnica - Arnica Angustifolia Vahl ssp. tomentosa (Macoun) G.W. Douglas & G. Ruyle-Douglas
- Narrowleaf Bedstraw - Galium Angustifolium Nutt. ex A. Gray
- Narrowleaf Bedstraw - Galium Angustifolium Nutt. ex A. Gray ssp. angustifolium
- Narrowleaf Bedstraw - Galium Angustifolium Nutt. ex A. Gray ssp. foliosum (Hilend & J.T. Howell) Dempster &
- Narrowleaf Bedstraw - Galium Angustifolium Nutt. ex A. Gray ssp. nudicaule Dempster & Stebbins
- Narrowleaf Bittercress - Cardamine Impatiens L.
- Narrowleaf Blue Eyed Mary - Collinsia Linearis A. Gray
- Narrowleaf Blue-eyed Grass - Sisyrinchium Angustifolium Mill.
- Narrowleaf Bluecurls - Trichostema Setaceum Houtt.
- Narrowleaf Brickellbush - Brickellia Oblongifolia Nutt. var. linifolia (D.C. Eaton) B.L. Rob.
- Narrowleaf Bur-reed - Sparganium Angustifolium Michx.
- Narrowleaf Cattail - Typha Angustifolia L.
- Narrowleaf Clubmoss - Huperzia Tenuicaulis (Underw. & Lloyd) B. Pllg.
- Narrowleaf Colicwood - Myrsine Linearifolia Hosaka
- Narrowleaf Cottonrose - Logfia Gallica (L.) Coss. & Germ.
- Narrowleaf Cottonwood - Populus Angustifolia James
- Narrowleaf Cowwheat - Melampyrum Lineare Desr.
- Narrowleaf Cowwheat - Melampyrum Lineare Desr. var. latifolium Bart.
- Narrowleaf Cowwheat - Melampyrum Lineare Desr. var. lineare
- Narrowleaf Cowwheat - Melampyrum Lineare Desr. var. pectinatum (Pennell) Fernald
- Narrowleaf Crimson Clover - Trifolium Angustifolium L.
- Narrowleaf Crucianella - Crucianella Angustifolia L.
- Narrowleaf Desert Honeysuckle - Anisacanthus Linearis (Hagen) Henrickson & Lott
- Narrowleaf Dock - Rumex Stenophyllus Ledeb.
- Narrowleaf Equallip Orchid - Isochilus Linearis (Jacq.) R. Br.
- Narrowleaf Evening Primrose - Oenothera Fruticosa L.
- Narrowleaf Evening Primrose - Oenothera Fruticosa L. ssp. fruticosa
- Narrowleaf Evening Primrose - Oenothera Fruticosa L. ssp. tetragona (Roth) W.L. Wagner
- Narrowleaf False Dragonhead - Physostegia Angustifolia Fernald
- Narrowleaf Firethorn - Pyracantha Angustifolia (Franch.) C.K. Schneid.
- Narrowleaf Four O'clock - Mirabilis Linearis (Pursh) Heimerl
- Narrowleaf Gentian - Gentiana Linearis Froel.
- Narrowleaf Goldenaster - Chrysopsis Linearifolia Semple
- Narrowleaf Goldenaster - Chrysopsis Linearifolia Semple ssp. linearifolia
- Narrowleaf Goldenbush - Ericameria Linearifolia (DC.) Urbatsch & Wussow
- Narrowleaf Goldshower - Galphimia Angustifolia Benth.
- Narrowleaf Goosefoot - Chenopodium Leptophyllum (Moq.) Nutt. ex S. Watson
- Narrowleaf Grapefern - Botrychium Lineare W.H. Wagner
- Narrowleaf Gumweed - Grindelia Lanceolata Nutt.
- Narrowleaf Gumweed - Grindelia Lanceolata Nutt. var. lanceolata
- Narrowleaf Hawksbeard - Crepis Tectorum L.
- Narrowleaf Hawkweed - Hieracium Umbellatum L.
- Narrowleaf Hempnettle - Galeopsis Angustifolia Ehrh. ex Hoffm.
- Narrowleaf Hoarypea - Tephrosia Angustissima Shuttlw. ex Chapm.
- Narrowleaf Hoarypea - Tephrosia Angustissima Shuttlw. ex Chapm. var. angustissima
- Narrowleaf Hoarypea - Tephrosia Angustissima Shuttlw. ex Chapm. var. corallicola (Small) Isely
- Narrowleaf Indian Breadroot - Pediomelum Linearifolium (Torr. & A. Gray) J. Grimes
- Narrowleaf Ironweed - Vernonia Lettermannii Engelm. ex A. Gray
- Narrowleaf Knotweed - Polygonum Bellardii All.
- Narrowleaf Laphamia - Perityle Intricata (Brandegee) Shinners
- Narrowleaf Lespedeza - Lespedeza Angustifolia (Pursh) Elliott
- Narrowleaf Lupine - Lupinus Angustifolius L.
- Narrowleaf Marsh Elder - Iva Angustifolia Nutt. ex DC.
- Narrowleaf Midsorus Fern - Blechnum Polypodioides Raddi
- Narrowleaf Milkvetch - Astragalus Pectinatus (Douglas ex Hook.) Douglas ex G. Don
- Narrowleaf Minerslettuce - Montia Linearis (Douglas ex Hook.) Greene
- Narrowleaf Mock Goldenweed - Nestotus Stenophyllus (A. Gray) R.P. Roberts, Urbatsch & Neubig
- Narrowleaf Moonpod - Selinocarpus Angustifolius Torr.
- Narrowleaf Morning-glory - Ipomoea Shumardiana (Torr.) Shinners
- Narrowleaf Mountainmint - Pycnanthemum Tenuifolium Schrad.
- Narrowleaf Onion - Allium Amplectens Hook.
- Narrowleaf Oxytheca - Oxytheca Dendroidea Nutt.
- Narrowleaf Paleseed - Leucospora Multifida (Michx.) Nutt.
- Narrowleaf Pectis - Pectis Angustifolia Torr. var. angustifolia
- Narrowleaf Pinweed - Lechea Tenuifolia Michx.
- Narrowleaf Plantain Lily - Hosta Lancifolia (Thunb.) Engl.
- Narrowleaf Plantain - Plantago Lanceolata L.
- Narrowleaf Pondweed - Potamogeton Strictifolius Benn.
- Narrowleaf Primrose-willow - Ludwigia Linearis Walter
- Narrowleaf Purple Coneflower - Echinacea Angustifolia DC.
- Narrowleaf Purple Coneflower - Echinacea Angustifolia DC. var. angustifolia
- Narrowleaf Purple Coneflower - Echinacea Angustifolia DC. var. strigosa R.L. McGregor
- Narrowleaf Purple Everlasting - Gamochaeta Falcata (Lam.) Cabrera
- Narrowleaf Pussytoes - Antennaria Stenophylla (A. Gray) A. Gray
- Narrowleaf Queen Poppy - Platystigma Linearis Benth.
- Narrowleaf Red Ironbark - Eucalyptus Crebra F. Muell.
- Narrowleaf Rhombopod - Cleomella Angustifolia Torr.
- Narrowleaf Rose Gentian - Sabatia Brachiata Elliott
- Narrowleaf Sandpaper Plant - Petalonyx Linearis Greene
- Narrowleaf Saw-wort - Saussurea Angustifolia (Willd.) DC.
- Narrowleaf Saw-wort - Saussurea Angustifolia (Willd.) DC. var. angustifolia
- Narrowleaf Saw-wort - Saussurea Angustifolia (Willd.) DC. var. yukonensis A.E. Porsild
- Narrowleaf Silkgrass - Pityopsis Graminifolia (Michx.) Nutt.
- Narrowleaf Silkgrass - Pityopsis Graminifolia (Michx.) Nutt. var. aequilifolia Semple & F.D. Bowers
- Narrowleaf Silkgrass - Pityopsis Graminifolia (Michx.) Nutt. var. graminifolia
- Narrowleaf Silkgrass - Pityopsis Graminifolia (Michx.) Nutt. var. latifolia (Fernald) Semple & F.D. Bowers
- Narrowleaf Silkgrass - Pityopsis Graminifolia (Michx.) Nutt. var. tenuifolia (Torr.) Semple & F.D. Bowers
- Narrowleaf Silverbush - Argythamnia Lanceolata (Benth.) Müll. Arg.
- Narrowleaf Skullcap - Scutellaria Angustifolia Pursh
- Narrowleaf Skullcap - Scutellaria Angustifolia Pursh ssp. angustifolia
- Narrowleaf Skullcap - Scutellaria Angustifolia Pursh ssp. micrantha Olmstead
- Narrowleaf Soap Plant - Chlorogalum Angustifolium Kellogg
- Narrowleaf Spiderling - Boerhavia Linearifolia A. Gray
- Narrowleaf Spineflower - Chorizanthe Angustifolia Nutt.
- Narrowleaf Stenogyne - Stenogyne Angustifolia A. Gray
- Narrowleaf Stoneseed - Lithospermum Incisum Lehm.
- Narrowleaf Suncup - Camissonia Refracta (S. Watson) P.H. Raven
- Narrowleaf Swordfern - Polystichum Imbricans (D.C. Eaton) D.H. Wagner
- Narrowleaf Swordfern - Polystichum Imbricans (D.C. Eaton) D.H. Wagner ssp. curtum (Ewan) D.H. Wagner
- Narrowleaf Swordfern - Polystichum Imbricans (D.C. Eaton) D.H. Wagner ssp. imbricans
- Narrowleaf Terciopelo - Clidemia Angustilamina W.S. Judd & Skean
- Narrowleaf Thorow Wax - Bupleurum Odontites L.
- Narrowleaf Trefoil - Lotus Tenuis Waldst. & Kit. ex Willd.
- Narrowleaf Vervain - Verbena Simplex Lehm.
- Narrowleaf Water Plantain - Alisma Gramineum Lej.
- Narrowleaf Water-starwort - Callitriche Intermedia Hoffm.
- Narrowleaf Water-starwort - Callitriche Intermedia Hoffm. ssp. hamulata (Kütz. ex W.D.J. Koch) Clapham
- Narrowleaf Water-starwort - Callitriche Intermedia Hoffm. ssp. intermedia Hoffm. [excluded]
- Narrowleaf Whitetop Aster - Sericocarpus Linifolius (L.) Britton, Sterns & Poggenb.
- Narrowleaf Wild Leek - Allium Burdickii (Hanes) A.G. Jones
- Narrowleaf Wildparsley - Musineon Lineare (Rydb.) Mathias
- Narrowleaf Willow - Salix Exigua Nutt.
- Narrowleaf Wirelettuce - Stephanomeria Minor (Hook.) Nutt. var. minor
- Narrowleaf Wirelettuce - Stephanomeria Minor (Hook.) Nutt. var. myrioclada (D.C. Eaton) Kartesz
- Narrowleaf Yellowtops - Flaveria Linearis Lag.
- Narrowleaf Yerba Santa - Eriodictyon Angustifolium Nutt.
- Narrowleaf Yucca - Yucca Angustissima Engelm. ex Trel.
- Narrowleaf Yucca - Yucca Angustissima Engelm. ex Trel. var. angustissima
- Narrowleaf Zinnia - Zinnia Angustifolia Kunth
- Narrowpanicle Rush - Juncus Brevicaudatus (Engelm.) Fernald
- Narrowpetal Wakerobin - Trillium Angustipetalum (Torr.) J.D. Freeman
- Narrowpod Sensitive Pea - Chamaecrista Lineata (Sw.) Greene
- Narrowpod Sensitive Pea - Chamaecrista Lineata (Sw.) Greene var. brachyloba (Griseb.) Irwin & Barneby
- Narrowpod Sensitive Pea - Chamaecrista Lineata (Sw.) Greene var. keyensis (Pennell) Irwin & Barneby
- Narrowpoint Knotweed - Polygonum Leptocarpum B.L. Rob.
- Narrowseed Yampah - Perideridia Leptocarpa T.I. Chuang & Constance
- Narrowsepal Phacelia - Phacelia Leptosepala Rydb.
- Narrowstem Cryptantha - Cryptantha Gracilis Osterh.
- Narrowtip Lepisorus - Lepisorus Mucronatus (Fée) Li Wang
- Narthecium Glutinosum Michx.
- Narthecium Montanum (Small) Grey
- Narthecium Ossifragum (L.) Huds. var. americanum (Ker Gawl.) A. Gray
- Narthecium Pusillum Michx.
- Nash's Blue-eyed Grass - Sisyrinchium Nashii E.P. Bicknell
- Nash's Pricklypear - Consolea Nashii (Britton) A. Berger
- Nashia - Nashia Millsp.
- Nashville Hawthorn - Crataegus Ater Ashe
- Nassella Brachychaeta (Godr.) Barkworth
- Nassella Formicarum auct. non (Delile) Barkworth
- Nassella Hyalina (Nees) Barkworth
- Nassella Megapotamica (Spreng. ex Trin.) Barkworth
- Nassella Tenuis (Phil.) Barkworth
- Nasturtium Amphibium (L.) W.T. Aiton
- Nasturtium Armoracia (L.) Fr.
- Nasturtium Austriacum Crantz
- Nasturtium Calycinum Engelm.
- Nasturtium Crystallinum (Rollins) Mulligan
- Nasturtium Curvisiliqua (Hook.) Nutt. ex Torr. & A. Gray
- Nasturtium Curvisiliqua (Hook.) Nutt. ex Torr. & A. Gray var. nuttallii S. Watson
- Nasturtium Heterophyllum Blume
- Nasturtium Lacustre A. Gray
- Nasturtium Lyratum Nutt.
- Nasturtium Microspermum DC.
- Nasturtium Nasturtium-aquaticum (L.) Karsten
- Nasturtium Obtusum Nutt. var. alpinum S. Watson
- Nasturtium Occidentale Greene
- Nasturtium Officinale W.T. Aiton var. microphyllum (Boenn. ex Rchb.) Thell.
- Nasturtium Officinale W.T. Aiton var. siifolium (Rchb.) W.D.J. Koch
- Nasturtium Sarmentosum (G. Forst. ex DC.) Schinz & Guillaumin
- Nasturtium Sessiliflorum Nutt.
- Nasturtium Sinuatum Nutt.
- Nasturtium Sinuatum Nutt. var. columbiae Suksd. ex B.L. Rob.
- Nasturtium Sphaerocarpum A. Gray
- Nasturtium Stylosum Shuttlw. ex O.E. Schulz
- Nasturtium - Tropaeolum L.
- Nasturtium - Tropaeolum Majus L.
- Natal Bottlebrush - Greyia Hook. & Harv.
- Natal Bottlebrush - Greyia Radlkoferi Szyszyl.
- Natal Crabgrass - Digitaria Natalensis Stent [excluded]
- Natal Glorybower - Clerodendrum Glabrum E. Mey.
- Natal Indigo - Indigofera Arrecta Hochst. ex A. Rich.
- Natal Orange - Strychnos Spinosa Lam.
- Natal Plum - Anechites Nerium (Aubl.) Urb.
- Nathorist's Aspicilia - Aspicilia Nathoristii (Lynge) J.W. Thomson
- Native American Pipeweed - Eriogonum Fusiforme Small
- Native Begonia - Begonia Decandra Pav. ex A. DC.
- Native Caper - Capparis Sandwichiana DC.
- Native Mulberry - Pipturus Argenteus (G. Forst.) Wedd. var. argenteus
- Native Sedge - Carex Vernacula L.H. Bailey
- Native Yellow Purslane - Portulaca Lutea Sol. ex G. Forst.
- Naturita Milkvetch - Astragalus Naturitensis Payson
- Naudin's Cyclanthera - Cyclanthera Naudiniana Cogn.
- Naumburgia Thyrsiflora (L.) Duby
- Naupaka Kuahiwi - Scaevola Chamissoniana Gaudich.
- Naupaka - Scaevola L.
- Naupaka - Scaevola ×cerasifolia Skottsb. (pro sp.)
- Navajo Bladderpod - Lesquerella Navajoensis O'Kane
- Navajo Bridge Pricklypear - Opuntia Polyacantha Haw. var. nicholii (L.D. Benson) Parfitt
- Navajo Cinquefoil - Potentilla Subviscosa Greene
- Navajo Cinquefoil - Potentilla Subviscosa Greene var. ramulosa (Rydb.) Kearney & Peebles
- Navajo Cinquefoil - Potentilla Subviscosa Greene var. subviscosa
- Navajo Evening Primrose - Oenothera Caespitosa Nutt. ssp. navajoensis W.L. Wagner, Stockhouse & Klein
- Navajo Fleabane - Erigeron Concinnus (Hook. & Arn.) Torr. & A. Gray
- Navajo Fleabane - Erigeron Concinnus (Hook. & Arn.) Torr. & A. Gray var. concinnus
- Navajo Fleabane - Erigeron Concinnus (Hook. & Arn.) Torr. & A. Gray var. condensatus D.C. Eaton
- Navajo Fleabane - Erigeron Concinnus (Hook. & Arn.) Torr. & A. Gray var. subglaber (Cronquist) G.L. N
- Navajo Mountain Beardtongue - Penstemon Navajoa N.H. Holmgren
- Navajo Mountain Phlox - Phlox Cluteana A. Nelson
- Navajo Muhly - Muhlenbergia Arsenei Hitchc.
- Navajo Pincushion Cactus - Pediocactus Peeblesianus (Croizat) L.D. Benson
- Navajo Saltbush - Atriplex Navajoensis C.A. Hanson
- Navajo Sedge - Carex Specicola J.T. Howell
- Navajo Tea - Thelesperma Subnudum A. Gray
- Navajo Tea - Thelesperma Subnudum A. Gray var. marginatum (Rydb.) T.E. Melchert ex Cronquist
- Navajo Tea - Thelesperma Subnudum A. Gray var. subnudum
- Navajo Thistle - Cirsium Navajoense J.W. Moore & Frankton
- Navajo Yucca - Yucca Baileyi Wooton & Standl.
- Navajo Yucca - Yucca Baileyi Wooton & Standl. var. baileyi
- Navajo Yucca - Yucca Baileyi Wooton & Standl. var. navajoa (J.M. Webber) J.M. Webber
- Navarretia Abramsii Elmer
- Navarretia Bakeri H. Mason
- Navarretia Hamata Greene ssp. foliacea (Greene) H. Mason
- Navarretia Hamata Greene var. foliacea (Greene) Thorne
- Navarretia Heterodoxa (Greene) Greene ssp. rosulata (Brand) H. Mason
- Navarretia Hirsutissima Brand
- Navarretia Intertexta (Benth.) Hook. var. propinqua (Suksd.) Brand
- Navarretia Minima Nutt.
- Navarretia Minima Nutt. var. intertexta (Benth.) B. Boivin
- Navarretia Mitracarpa Greene
- Navarretia Mitracarpa Greene ssp. jaredii (Eastw.) H. Mason
- Navarretia Mitracarpa auct. non Greene
- Navarretia Nigelliformis Greene var. radians J.T. Howell
- Navarretia Pauciflora H. Mason
- Navarretia Plieantha H. Mason
- Navarretia Prolifera Greene var. lutea Brand
- Navarretia Propinqua Suksd.
- Navarretia Schottii Torr.
- Navasota False Foxglove - Agalinis Navasotensis M. Dubrule & J. Canne-Hilliker
- Navasota Lady's Tresses - Spiranthes Parksii Correll
- Navassa Clearweed - Pilea Perfragilis Ekman
- Navassa Nakedstem Carpetweed - Mollugo Nudicaulis Lam. var. navassensis Ekman
- Navel Cornsalad - Valerianella Umbilicata (Sull.) Alph. Wood
- Navel Lichen - Umbilicaria Angulata Tuck.
- Navel Lichen - Umbilicaria Aprina Nyl.
- Navel Lichen - Umbilicaria Cinereorufescens (Schaerer) Frey
- Navel Lichen - Umbilicaria Decussata (Vill.) Zahlbr.
- Navel Lichen - Umbilicaria Deusta (L.) Baumg.
- Navel Lichen - Umbilicaria Hoffm.
- Navel Lichen - Umbilicaria Hyperborea (Ach.) Hoffm.
- Navel Lichen - Umbilicaria Hyperborea (Ach.) Hoffm. var. hyperborea
- Navel Lichen - Umbilicaria Hyperborea (Ach.) Hoffm. var. radicicula (J.E. Zetterst.) Hasselrot
- Navel Lichen - Umbilicaria Leiocarpa DC.
- Navel Lichen - Umbilicaria Mammulata (Ach.) Tuck.
- Navel Lichen - Umbilicaria Phaea Tuck.
- Navel Lichen - Umbilicaria Proboscidea (L.) Schrad.
- Navel Lichen - Umbilicaria Torrefacta (Lightf.) Schrad.
- Navel Lichen - Umbilicaria Vellea (L.) Ach.
- Navel Lichen - Umbilicaria Virginis Schaerer
- Navelwort - Omphalodes Mill.
- Nazia Aliena auct. non (Spreng.) Scribn.
- Nazia Racemosa (L.) Kuntze
- Neal's Manfern - Cibotium Nealiae O. Deg.
- Nealie - Acacia Rigens A. Cunn. ex G. Don
- Nealley's Cloak Fern - Notholaena Nealleyi Seaton ex J.M. Coult.
- Nealley's Globe Amaranth - Gomphrena Nealleyi J.M. Coult. & Fisher
- Nealley's Kisses - Oenothera Suffulta (Engelm. ex A. Gray) W.L. Wagner & Hoch ssp. nealleyi (J.M. Coul
- Nealley's Sprangletop - Leptochloa Nealleyi Vasey
- Nealley's Woollygrass - Erioneuron Nealleyi (Vasey) Tateoka
- Near Navarretia - Navarretia Intertexta (Benth.) Hook. ssp. propinqua (Suksd.) Day
- Nearing's Lecidea Lichen - Lecidea Nearingii H. Magn.
- Nearlyblack Sedge - Carex Subnigricans Stacey
- Nebraska Aster - Symphyotrichum Praealtum (Poir.) G.L. Nesom var. nebraskense (Britton) G.L. Nesom
- Nebraska Lupine - Lupinus Plattensis S. Watson
- Nebraska Sedge - Carex Nebrascensis Dewey
- Nebraska Tansyaster - Machaeranthera Canescens (Pursh) A. Gray ssp. glabra (A. Gray) B.L. Turner var. nebraskan
- Nechamandra - Nechamandra Alternifolia (Roxb.) Thw.
- Nechamandra - Nechamandra Planch.
- Neches River Rosemallow - Hibiscus Dasycalyx S.F. Blake & Shiller
- Necker's Felt Lichen - Peltigera Neckeri Hepp ex Müll. Arg.
- Necker's Thamnobryum Moss - Thamnobryum Neckeroides (Hook.) E. Lawton
- Neckera Disticha Hedw.
- Neckera Gracilis (James) Kindb.
- Neckera Menziesii Hook.
- Neckera Menziesii Hook. var. amblyclada Kindb.
- Neckera Moss - Neckera Complanata (Hedw.) Hüb.
- Neckera Moss - Neckera Hedw.
- Neckera Moss - Neckera Pennata Hedw.
- Neckera Neomexicana (Cardot) Grout
- Neckera Oligocarpa Bruch
- Neckera Pennata Hedw. var. oligocarpa (Bruch) Müll. Hal.
- Neckera Pennata Hedw. var. tenera Müll. Hal.
- Neckera Undulata Hedw.
- Neckeradelphus Menziesii (Hook.) Steere
- Neckeropsis Moss - Neckeropsis Disticha (Hedw.) Kindb.
- Neckeropsis Moss - Neckeropsis Reichardt
- Necklace Fern - Lindsaea Dryand. ex Sm.
- Necklace Fern - Lindsaea Obtusa J. Sm. ex Hook.
- Necklace Fern - Lindsaea Propinqua Hook.
- Necklace Fern - Lindsaea Repens (Bory) Thwaites var. pectinata (Blume) Mett. ex Kuhn
- Necklace Fern - Lindsaea Tetragona K.U. Kramer
- Necklace Gladecress - Leavenworthia Torulosa A. Gray
- Necklace Island Spleenwort - Diellia Leucostegioides (Baker) W.H. Wagner
- Necklace Sedge - Carex Projecta Mack.
- Necklace Spike Sedge - Carex Ormostachya Wiegand
- Necklace Tree - Ormosia Calavensis Blanco
- Necklacepod - Sophora L.
- Necklacepod - Styphnolobium Schott
- Neckweed - Veronica Peregrina L.
- Neckweed - Veronica Peregrina L. ssp. peregrina
- Nectandra Antillana Meisn.
- Nectandra Sintenisii Mez
- Nectarine - Prunus Persica (L.) Batsch var. nucipersica (Suckow) C.K. Schneid.
- Nectouxia - Nectouxia Kunth
- Nectria Fr.
- Nectria Lecanodes Ces.
- Nectria Parmeliae (Berk. & Curt.) D. Hawskw.
- Nectria Rubifaciens Ellis & Everh.
- Nectria Zonata Seaver
- Nectriella Anisospora Lowen
- Needle And Thread - Hesperostipa (elias) Barkworth
- Needle And Thread - Hesperostipa Comata (Trin. & Rupr.) Barkworth
- Needle And Thread - Hesperostipa Comata (Trin. & Rupr.) Barkworth ssp. comata
- Needle Beaksedge - Rhynchospora Capillacea Torr.
- Needle Blue-eyed Grass - Sisyrinchium Capillare E.P. Bicknell
- Needle Goldfields - Lasthenia Gracilis (DC.) Greene
- Needle Grama - Bouteloua Aristidoides (Kunth) Griseb.
- Needle Grama - Bouteloua Aristidoides (Kunth) Griseb. var. aristidoides
- Needle Indiangrass - Sorghastrum Stipoides (Kunth) Nash
- Needle Lichen - Chaenotheca Brachypoda (Ach.) Tibell
- Needle Lichen - Chaenotheca Brunneola (Ach.) Müll. Arg.
- Needle Lichen - Chaenotheca Chlorella (Ach.) Müll. Arg.
- Needle Lichen - Chaenotheca Chrysocephala (Turner ex Ach.) Th. Fr.
- Needle Lichen - Chaenotheca Cinerea (Pers.) Tibell
- Needle Lichen - Chaenotheca Ferruginea (Turner & Borrer) Mig.
- Needle Lichen - Chaenotheca Furfuracea (L.) Tibell
- Needle Lichen - Chaenotheca Gracillima (Vain.) Tibell
- Needle Lichen - Chaenotheca Laevigata Nadv.
- Needle Lichen - Chaenotheca Phaeocephala (Turner) Th. Fr.
- Needle Lichen - Chaenotheca Stemonea (Ach.) Müll. Arg.
- Needle Lichen - Chaenotheca Subroscida (Eitner) Zahlbr.
- Needle Lichen - Chaenotheca Th. Fr.
- Needle Lichen - Chaenotheca Trichialis (Ach.) Th. Fr.
- Needle Lichen - Chaenotheca Xyloxena Nadv.
- Needle Mountain Milkvetch - Astragalus Eurylobus (Barneby) Barneby
- Needle Palm - Rhapidophyllum Hystrix (Pursh) H. Wendl. & Drude ex Drude
- Needle Spikerush - Eleocharis Acicularis (L.) Roem. & Schult.
- Needle Spikerush - Eleocharis Acicularis (L.) Roem. & Schult. var. acicularis
- Needle Spikerush - Eleocharis Acicularis (L.) Roem. & Schult. var. porcata S.G. Sm.
- Needle Stonecrop - Sedum Lineare Thunb.
- Needle's Buckwheat - Eriogonum Breedlovei (J.T. Howell) Reveal var. shevockii J.T. Howell
- Needle-bark Stringybark - Eucalyptus Planchoniana F. Muell.
- Needlebush - Glochidion Puberum (L.) Hutch.
- Needlegrass - Achnatherum P. Beauv.
- Needlegrass - Nassella (trin.) Desv.
- Needlegrass Rush - Juncus Roemerianus Scheele
- Needlegrass - Stipa Breviflora Griseb.
- Needlegrass - Stipa Caucasica Schmalh.
- Needlegrass - Stipa Caucasica Schmalh. ssp. glareosa (P.A. Smirn.) Tzvel.
- Needlegrass - Stipa Grandis P.A. Smirn.
- Needlegrass - Stipa Kirghisorum P.A. Smirn.
- Needlegrass - Stipa Klemenzii Roshev.
- Needlegrass - Stipa Krylovii Roshev.
- Needlegrass - Stipa Sibirica (L.) Lam.
- Needlegrass - Triraphis R. Br.
- Needleleaf Bluet - Houstonia Acerosa (A. Gray) A. Gray ex Benth. & Hook. f.
- Needleleaf Bluet - Houstonia Acerosa (A. Gray) A. Gray ex Benth. & Hook. f. var. acerosa
- Needleleaf Bluet - Houstonia Acerosa (A. Gray) A. Gray ex Benth. & Hook. f. var. polypremoides (A. Gr
- Needleleaf Clubmoss - Huperzia Linifolia (L.) Trevis.
- Needleleaf Fleabane - Erigeron Nematophyllus Rydb.
- Needleleaf Halodule - Halodule Pinifolia (Miki) Hartog
- Needleleaf Navarretia - Navarretia Intertexta (Benth.) Hook.
- Needleleaf Navarretia - Navarretia Intertexta (Benth.) Hook. ssp. intertexta
- Needleleaf Rosette Grass - Dichanthelium Aciculare (Desv. ex Poir.) Gould & C.A. Clark
- Needleleaf Sedge - Carex Duriuscula C.A. Mey.
- Needleleaf Waternymph - Najas Filifolia Haynes
- Needlepod Rush - Juncus Scirpoides Lam.
- Needleroot Airplant Orchid - Harrisella Porrecta (Rchb. f.) Fawc. & Rendle
- Needleroot Bentspur Orchid - Campylocentrum Filiforme (Sw.) Cogn. ex Kuntze
- Needletip Blue-eyed Grass - Sisyrinchium Mucronatum Michx.
- Needletip Trumpets - Acleisanthes Acutifolia Standl.
- Neem - Azadirachta Indica A. Juss.
- Neese's Blue Mountain Beardtongue - Penstemon Scariosus Pennell var. cyanomontanus Neese
- Neglected Balsamroot - Balsamorhiza Hookeri (Hook.) Nutt. var. neglecta (Sharp) Cronquist
- Neglected Sunflower - Helianthus Neglectus Heiser
- Negra Lora - Matayba Domingensis (DC.) Radlk.
- Negundo Aceroides (L.) Moench
- Negundo Aceroides (L.) Moench ssp. interius (Britton) Á. Löve & D. Löve
- Negundo Aceroides (L.) Moench ssp. violaceum (G. Kirchn.) W.A. Weber
- Negundo Californicum Torr. & A. Gray
- Negundo Interius (Britton) Rydb.
- Negundo Negundo (L.) Karst., nom. inval.
- Nehe Kuhiwa - Phyllostegia Electra Forbes
- Nehe - Lipochaeta Connata (Gaudich.) DC.
- Nehe - Lipochaeta Connata (Gaudich.) DC. var. acris (Sherff) R.C. Gardner
- Nehe - Lipochaeta Connata (Gaudich.) DC. var. connata
- Nehe - Lipochaeta Dc.
- Nehe - Lipochaeta ×procumbens O. Deg. & Sherff
- Neisosperma - Neisosperma Oppositifolia (Lam.) Fosberg & Sachet
- Neisosperma - Neisosperma Raf.
- Nellie Cory Cactus - Escobaria Minima (Baird) D.R. Hunt
- Nelson's Brachythecium Moss - Brachythecium Nelsonii Grout
- Nelson's Brickellbush - Brickellia Nelsonii B.L. Rob. [excluded]
- Nelson's Buttercup - Ranunculus Occidentalis Nutt. var. nelsonii (DC.) L.D. Benson
- Nelson's Checkerbloom - Sidalcea Nelsoniana Piper
- Nelson's Horsenettle - Solanum Nelsonii Dunal
- Nelson's Milkvetch - Astragalus Nelsonianus Barneby
- Nelson's Mimosa - Mimosa Quadrivalvis L. var. nelsonii (Britton & Rose) Barneby
- Nelson's Sedge - Carex Nelsonii Mack.
- Nelson's Tansymustard - Descurainia Pinnata (Walter) Britton ssp. nelsonii (Rydb.) Detling
- Nelsonia Brunelloides (Lam.) Kuntze
- Nelsonia - Nelsonia R. Br.
- Neltuma Velutina (Wooton) Britton & Rose
- Nelumbium Luteum Willd., orth. var.
- Nelumbium Nelumbo (L.) Druce
- Nelumbium Speciosum Willd., orth. var.
- Nelumbo Pentapetala (Walter) Fernald, nom. utique rej.
- Nelumbo Speciosa Willd.
- Nemacladus Rubescens Greene var. interior (Munz) McVaugh
- Nemastylis Acuta Herb.
- Nemastylis Coelestina (W. Bartram) Nutt.
- Nemastylis Pringlei S. Watson
- Nemastylis Purpurea Herb.
- Nemastylis Tenuis (Herb.) Benth. var. pringlei (S. Watson) R.C. Foster
- Nemesia - Nemesia Vent.
- Nemexia Biltmoreana Small
- Nemexia Ecirrhata (Engelm. ex Kunth) Small
- Nemexia Herbacea (L.) Small
- Nemexia Hugeri Small
- Nemexia Lasioneura (Hook.) Rydb.
- Nemexia Leptanthera (Pennell) Small
- Nemexia Pulverulenta (Michx.) Small
- Nemexia Tamnifolia (Michx.) Small
- Nemoca Cimarrona - Ocotea Spathulata Mez
- Nemoca - Ocotea Moschata (Pav. ex Meisn.) Mez
- Nemopanthus Collinus (Alexander) R. Clark
- Nemopanthus Mucronatus (L.) Loes.
- Nemopanthus - Nemopanthus Raf.
- Nemophila Heterophylla Fisch. & C.A. Mey. var. tenera (Eastw.) A. Nelson & J.F. Macbr.
- Nemophila Menziesii Hook. & Arn. ssp. atomaria (Fisch. & C.A. Mey.) Brand
- Nemophila Menziesii Hook. & Arn. ssp. australis Brand
- Nemophila Menziesii Hook. & Arn. ssp. insignis (Benth.) Brand
- Nemophila Menziesii Hook. & Arn. ssp. integrifolia (Parish) Munz
- Nemophila Menziesii Hook. & Arn. var. annulata Chandler
- Nemophila Menziesii Hook. & Arn. var. discoidalis (Lem.) Voss
- Nemophila Menziesii Hook. & Arn. var. incana Brand
- Nemophila Menziesii Hook. & Arn. var. intermedia (Bioletti) Brand
- Nemophila Menziesii Hook. & Arn. var. rotata (Eastw.) Chandler
- Nemophila Menziesii Hook. & Arn. var. venosa (Jeps.) Brand
- Nemophila Microcalyx (Nutt.) Fisch. & C.A. Mey.
- Nemophila Triloba (Raf.) Thieret
- Neneleau - Rhus Sandwicensis A. Gray
- Neobesseya Missouriensis (Sweet) Britton & Rose
- Neobesseya Wissmannii (Hildmann ex K. Schum.) Britton & Rose
- Neobrackenridge's Spleenwort - Asplenium Neobrackenridgei W.H. Wagner
- Neocardotia Subnigra (Mitt.) Thér. & E.B. Bartram
- Neocleome Serrata (Jacq.) Small
- Neocleome Spinosa (Jacq.) Small
- Neocupressus Arizonica (Greene) de Laub.
- Neocupressus Arizonica (Greene) de Laub. var. glabra (Sudw.) de Laub.
- Neocupressus Arizonica (Greene) de Laub. var. nevadensis (Abrams) de Laub.
- Neocupressus Bakeri (Jeps.) de Laub.
- Neocupressus Goveniana (Gordon) de Laub.
- Neocupressus Goveniana (Gordon) de Laub. var. abramsiana (C.B. Wolf) de Laub.
- Neocupressus Goveniana (Gordon) de Laub. var. pigmaea (Lemmon) de Laub.
- Neocupressus Guadalupensis (S. Watson) de Laub.
- Neocupressus Guadalupensis (S. Watson) de Laub. var. forbesii (Jeps.) de Laub.
- Neocupressus Lusitanica (Mill.) de Laub.
- Neocupressus Macnabiana (A. Murray bis) de Laub.
- Neocupressus Macrocarpa (Hartw.) de Laub.
- Neocupressus Sargentii (Jeps.) de Laub.
- Neoevansia Striata (Brandegee) Sánchez-Mejorada
- Neofuscelia Lichen - Neofuscelia Atticoides (Essl.) Essl.
- Neofuscelia Lichen - Neofuscelia Brunella (Essl.) Essl.
- Neofuscelia Lichen - Neofuscelia Essl.
- Neofuscelia Lichen - Neofuscelia Infrapallida (Essl.) Essl.
- Neofuscelia Lichen - Neofuscelia Loxodes (Nyl.) Essl.
- Neofuscelia Lichen - Neofuscelia Pustulosa (Essl.) Essl.
- Neofuscelia Lichen - Neofuscelia Subhosseana (Essl.) Essl.
- Neofuscelia Lichen - Neofuscelia Verruculifera (Nyl.) Essl.
- Neogaerrhinum Kelloggii (Greene) Thieret
- Neogaerrhinum - Neogaerrhinum Rothm.
- Neoholmgrenia Andina (Nutt.) W.L. Wagner & Hoch
- Neohyophila H.a. Crum
- Neohyophila Sprengelii (Schwägr.) H.A. Crum
- Neokochia Americana (S. Watson) G.L. Chu & S.C. Sand.
- Neokochia Californica (S. Watson) G.L. Chu & S.C. Sand.
- Neolamarckia - Neolamarckia F. Bosser
- Neolaugeria - Neolaugeria Nicolson
- Neolehmannia Difformis auct. non (Jacq.) Pabst
- Neolepia Campestris (L.) W.A. Weber
- Neolloydia Erectocentra (J.M. Coult.) L.D. Benson
- Neolloydia Erectocentra (J.M. Coult.) L.D. Benson var. acunensis (W.T. Marshall) L.D. Be
- Neolloydia Gautii L.D. Benson
- Neolloydia Intertexta (Engelm.) L.D. Benson
- Neolloydia Intertexta (Engelm.) L.D. Benson var. dasyacantha (Engelm.) L.D. Benson
- Neolloydia Johnsonii (Parry ex Engelm.) L.D. Benson
- Neolloydia Johnsonii (Parry ex Engelm.) L.D. Benson var. lutescens (Parish) W.T. Mars
- Neolloydia Mariposensis (Hester) L.D. Benson
- Neolloydia - Neolloydia Britton & Rose
- Neolloydia Warnockii L.D. Benson
- Neololeba - Neololeba Widjaja
- Neomacounia Moss - Neomacounia Irel.
- Neomacounia Moss - Neomacounia Nitida (Lindb.) Irel.
- Neomammillaria Nivosa (Link ex N.E. Pfeiffer) Britton & Rose
- Neomammillaria Similis (Engelm.) Britton & Rose ex Rydb.
- Neomarica Brachypus (Baker) Sprague
- Neomarica Caerulea (Ker Gawl.) Sprague
- Neomarica - Neomarica Sprague
- Neon Dot Lichen - Arthonia Neoni de Lesd.
- Neon Fissidens Moss - Fissidens Neonii (E.B. Bartram) Grout
- Neon's Orange Lichen - Caloplaca Neonii de Lesd.
- Neonauclea Forsteri Merrill
- Neonauclea Merr.
- Neonotonia - Neonotonia Lackey
- Neoparrya Megarrhiza (A. Nelson) W.A. Weber
- Neoparrya - Neoparrya Mathias
- Neopieris Mariana (L.) Britton
- Neopieris Nitida (W. Bartram ex Marshall) Britton
- Neoregelia - Neoregelia L.b. Sm.
- Neorudolphia - Neorudolphia Britton
- Neoschischkinia Nebulosa (Boiss. & Reut.) Tzvelev
- Neottia Auriculata (Wiegand) Szlach.
- Neottia Australis (Lindl.) Szlach.
- Neottia Banksiana (Lindl.) Rchb.f.
- Neottia Bifolia (Raf.) Baumbach
- Neottia Borealis (Morong) Szlach.
- Neottia Caurina (Piper) Szlach.
- Neottia Convallarioides (Sw.) Rich.
- Neottia Cordata (L.) Rich.
- Neottia Nephrophylla (Rydb.) Szlach.
- Neottia Smallii (Wiegand) Szlach.
- Neovriesia Macrostachya (Bello) Britton
- Neowashingtonia Filamentosa (Fenzi) Sudw.
- Neowawraea Phyllanthoides Rock
- Nepal Alder - Alnus Nepalensis D. Don
- Nepal Physciella - Physciella Nepalensis (Poelt) Essl.
- Nepalese Browntop - Microstegium Vimineum (Trin.) A. Camus
- Nepalese Firethorn - Pyracantha Crenulata (D. Don) Roem.
- Nepalese Smartweed - Polygonum Nepalense Meisn.
- Nepenthes L.
- Nepenthes Mirabilis Druce
- Nepeta Hederacea (L.) Trevis.
- Nepeta Mussinii Henckel
- Nephelea Portoricensis (Spreng. ex Kuhn) R. Tryon
- Nephelea Pubescens (Kunth) R. Tryon [excluded]
- Nephelea R. Tryon
- Nephelium Litchi Cambess.
- Nephelium - Nephelium L.
- Nephrodium Funestum (Kunze) Hook.
- Nephrodium ×pittsfordense Clute
- Nephrolepis Acutifolia (Desv.) Christ
- Nephrolepis Biserrata (Sw.) Schott var. furcans hort. ex L.H. Bailey
- Nephrolepis Brownii (Desv.) Hovenkamp & Miyam.
- Nephrolepis Occidentalis Kunze
- Nephrolepis Pectinata (Willd.) Schott [excluded]
- Nephroma Helveticum Ach. var. sipeanum (Gyel.) Wetmore
- Nephroma Laevigatum auct.
- Nephroma Lusitanicum Schaerer
- Nephroma Silvae-veteris Goward & Goffinet
- Nephroma Subtomentellum (Nyl.) Gyel.
- Nephropetalum Pringlei B.L. Rob. & Greenm.
- Nepsera - Nepsera Naud.
- Neptunia Floridana Small
- Neptunia Lutea (Leavenworth) Benth. var. multipinnatifida B.L. Turner
- Neptunia Microcarpa Rose
- Neptunia Oleracea Lour.
- Neptunia Palmeri Britton & Rose
- Neptunia Pubescens Benth. var. floridana (Small) B.L. Turner
- Neptunia Pubescens Benth. var. lindheimeri (B.L. Rob.) B.L. Turner
- Neraudia Cookii H. St. John
- Neraudia Kahoolawensis Hillebr.
- Neraudia Kauaiensis (Hillebr.) Cowan var. helleri Cowan
- Neraudia Melastomifolia Gaudich. var. gaudichaudii Cowan
- Neraudia Melastomifolia Gaudich. var. pallida Cowan
- Neraudia Melastomifolia Gaudich. var. parvifolia (Wawra) Hillebr.
- Neraudia Melastomifolia Gaudich. var. pubescens Cowan
- Neraudia Melastomifolia Gaudich. var. uncinata Cowan
- Nerine Bowdenii W. Watson
- Nerine - Nerine Herb.
- Nerium Grandiflorum Roxb. ex R. Br.
- Nertera Granadensis (L. f.) Druce
- Nertera Granadensis (L. f.) Druce var. insularis Skottsb.
- Nerveless Woodland Sedge - Carex Leptonervia (Fernald) Fernald
- Nerveray - Tetragonotheca L.
- Nervilia Aragoana Gaudich.
- Nervilia Comm. ex Gaudich.
- Nervilia Jacksoniae Rinehart & Fosberg
- Nervilia Platychila Schltr.
- Nesaea - Nesaea Comm. ex Kunth
- Nesaea Salicifolia Kunth
- Neslia - Neslia Desv.
- Nesogenes A. DC.
- Nesogenes Rotensis Fosberg & D.R. Herbst
- Nesolechia Cladoniscum (Willey) Fink
- Nesolechia Oxyspora (Tul.) A. Massal.
- Nesolechia Thallicola (A. Massal.) A. Massal.
- Nesoluma - Nesoluma Baill.
- Nested Polypody - Polypodium Calirhiza S. Whitmore & A.R. Sm.
- Nestegis - Nestegis Raf.
- Nestronia - Nestronia Raf.
- Neststraw - Ancistrocarphus A. Gray
- Neststraw - Stylocline Nutt.
- Netbush - Calothamnus Labill.
- Netleaf Bundleflower - Desmanthus Reticulatus Benth.
- Netleaf Hackberry - Celtis Laevigata Willd. var. reticulata (Torr.) L.D. Benson
- Netleaf Leather Flower - Clematis Reticulata Walter
- Netleaf Oak - Quercus Rugosa Née
- Netleaf Swampprivet - Forestiera Reticulata Torr.
- Netleaf White Oak - Quercus Polymorpha Schltdl. & Cham.
- Netleaf Willow - Salix Reticulata L.
- Netleaf Willow - Salix Reticulata L. ssp. glabellicarpa Argus
- Netleaf Willow - Salix Reticulata L. ssp. reticulata
- Netted Adderstongue - Ophioglossum Reticulatum L.
- Netted Anoda - Anoda Reticulata S. Watson
- Netted Chainfern - Woodwardia Areolata (L.) T. Moore
- Netted Globecherry - Margaranthus Solanaceus Schltdl.
- Netted Milkvine - Matelea Reticulata (Engelm. ex A. Gray) Woodson
- Netted Nutrush - Scleria Reticularis Michx.
- Netted Pawpaw - Asimina Reticulata Shuttlw. ex Chapm.
- Netted Popcornflower - Plagiobothrys Reticulatus (Piper) I.M. Johnst.
- Netted Rimelia Lichen - Rimelia Reticulata (Taylor) Hale & Fletcher
- Netted Shrubverbena - Lantana Reticulata Pers.
- Nettle - Urtica L.
- Nettle-leaf Mullein - Verbascum Chaixii Vill.
- Nettle-leaf Soldier - Galinsoga Urticifolia (Kunth) Benth.
- Nettleleaf Giant Hyssop - Agastache Urticifolia (Benth.) Kuntze
- Nettleleaf Giant Hyssop - Agastache Urticifolia (Benth.) Kuntze var. glaucifolia (A. Heller) Cronquist
- Nettleleaf Giant Hyssop - Agastache Urticifolia (Benth.) Kuntze var. urticifolia
- Nettleleaf Goosefoot - Chenopodium Murale L.
- Nettleleaf Noseburn - Tragia Urticifolia Michx.
- Nettleleaf Sage - Salvia Urticifolia L.
- Nettleleaf Shrubverbena - Lantana Urticifolia Mill.
- Nettleleaf Shrubverbena - Lantana Urticifolia Mill. ssp. moldenkei R.W. Sanders
- Nettleleaf Shrubverbena - Lantana Urticifolia Mill. ssp. urticifolia
- Nettleleaf Velvetberry - Stachytarpheta Urticifolia Sims
- Nettlespurge - Jatropha L.
- Netvein Dubautia - Dubautia Reticulata (Sherff) D.D. Keck
- Netvein Goldeneye - Viguiera Reticulata S. Watson
- Netvein Hollyfern - Cyrtomium C. Presl
- Neubeckia Cristata (Aiton) Alef.
- Neubeckia Verna (L.) Alef.
- Neuburgia Blume
- Neurachne Mitchelliana Nees
- Neuractis Bidens (Retz.) Veldkamp ex Mesfin
- Neurolaena - Neurolaena R. Br.
- Neurolejeunea (spruce) Schiffn.
- Neurolejeunea Breutelii (Gottsche) A. Evans
- Neuroloma Nudicaule (L.) DC.
- Neurophyllodes Arboreum (A. Gray) O. Deg.
- Neurophyllodes Multiflorum (A. Gray) O. Deg. & Greenw.
- Neurophyllodes Ovatifolium (A. Gray) O. Deg. & Greenw.
- Neuropogon Lambii Imshaug
- Neuropogon Sulphureus (J. Koenig) Hellbom
- Nevada Agave - Agave Utahensis Engelm. var. nevadensis Engelm. ex Greenm. & Roush
- Nevada Arnica - Arnica Nevadensis A. Gray
- Nevada Bedstraw - Galium Hypotrichium A. Gray ssp. nevadense Dempster & Ehrend.
- Nevada Bird's-foot Trefoil - Lotus Nevadensis (S. Watson) Greene
- Nevada Bird's-foot Trefoil - Lotus Nevadensis (S. Watson) Greene var. nevadensis
- Nevada Biscuitroot - Lomatium Nevadense (S. Watson) J.M. Coult. & Rose
- Nevada Biscuitroot - Lomatium Nevadense (S. Watson) J.M. Coult. & Rose var. nevadense
- Nevada Blazingstar - Mentzelia Dispersa S. Watson var. compacta (A. Nelson) J.F. Macbr.
- Nevada Blazingstar - Mentzelia Dispersa S. Watson var. obtusa Jeps.
- Nevada Blue-eyed Grass - Sisyrinchium Halophilum Greene
- Nevada Broomsage - Lepidospartum Latisquamum S. Watson
- Nevada Buckthorn - Frangula Rubra (Greene) V. Grub. ssp. nevadensis (A. Nelson) Kartesz & Gandhi
- Nevada Buckwheat - Eriogonum Deflexum Torr. var. nevadense Reveal
- Nevada Bulrush - Scirpus Nevadensis S. Watson
- Nevada Catchfly - Silene Nachlingerae Tiehm
- Nevada Cinquefoil - Potentilla Glandulosa Lindl. ssp. nevadensis (S. Watson) D.D. Keck
- Nevada City Buckwheat - Eriogonum Prattenianum Durand
- Nevada City Buckwheat - Eriogonum Prattenianum Durand var. avium Reveal & Shevock
- Nevada City Buckwheat - Eriogonum Prattenianum Durand var. prattenianum
- Nevada Cracked Lichen - Acarospora Nevadensis H. Magn.
- Nevada Cryptantha - Cryptantha Nevadensis A. Nelson & Kennedy
- Nevada Cryptantha - Cryptantha Nevadensis A. Nelson & Kennedy var. nevadensis
- Nevada Cryptantha - Cryptantha Nevadensis A. Nelson & Kennedy var. rigida I.M. Johnst.
- Nevada Dalea - Psorothamnus Polydenius (Torr. ex S. Watson) Rydb.
- Nevada Dalea - Psorothamnus Polydenius (Torr. ex S. Watson) Rydb. var. polydenius
- Nevada Dustymaiden - Chaenactis Nevadensis (Kellogg) A. Gray
- Nevada Gilia - Gilia Brecciarum M.E. Jones
- Nevada Gilia - Gilia Brecciarum M.E. Jones ssp. brecciarum
- Nevada Gilia - Gilia Brecciarum M.E. Jones ssp. jacens (A.D. Grant & V.E. Grant) Day
- Nevada Gilia - Gilia Brecciarum M.E. Jones ssp. neglecta A.D. Grant & V.E. Grant
- Nevada Goldeneye - Heliomeris Multiflora Nutt. var. nevadensis (A. Nelson) Yates
- Nevada Goldenrod - Solidago Spectabilis (D.C. Eaton) A. Gray
- Nevada Goldenrod - Solidago Spectabilis (D.C. Eaton) A. Gray var. confinis (A. Gray) Cronquist
- Nevada Goldenrod - Solidago Spectabilis (D.C. Eaton) A. Gray var. spectabilis
- Nevada Goosefoot - Chenopodium Nevadense Standl.
- Nevada Helianthella - Helianthella Californica A. Gray ssp. nevadensis (Greene) W.A. Weber
- Nevada Homalothecium Moss - Homalothecium Nevadense (Lesq.) Renauld & Cardot
- Nevada Jacob's-ladder - Polemonium Nevadense Wherry
- Nevada Jointfir - Ephedra Nevadensis S. Watson
- Nevada Lewisia - Lewisia Nevadensis (A. Gray) B.L. Rob.
- Nevada Lupine - Lupinus Nevadensis A. Heller
- Nevada Milkvetch - Astragalus Bisulcatus (Hook.) A. Gray var. nevadensis (M.E. Jones) Barneby
- Nevada Needlegrass - Achnatherum Nevadense (B.L. Johnson) Barkworth
- Nevada Onion - Allium Nevadense S. Watson
- Nevada Oryctes - Oryctes Nevadensis S. Watson
- Nevada Pea - Lathyrus Lanszwertii Kellogg
- Nevada Pea - Lathyrus Lanszwertii Kellogg var. aridus (Piper) Jeps.
- Nevada Pea - Lathyrus Lanszwertii Kellogg var. leucanthus (Rydb.) Dorn
- Nevada Peavine - Labordia Waiolani Wawra
- Nevada Podistera - Podistera Nevadensis (A. Gray) S. Watson
- Nevada Pottia Moss - Pottia Nevadensis Cardot & Thér.
- Nevada Primrose - Primula Cusickiana (A. Gray) A. Gray var. nevadensis (N.H. Holmgren) N.H. Holmgren
- Nevada Pussypaws - Cistanthe Parryi (A. Gray) Hershkovitz var. nevadensis (J.T. Howell) Kartesz & Ga
- Nevada Rockdaisy - Perityle Megalocephala (S. Watson) J.F. Macbr.
- Nevada Rockdaisy - Perityle Megalocephala (S. Watson) J.F. Macbr. var. megalocephala
- Nevada Rush - Juncus Tiehmii Ertter
- Nevada Sanddune Beardtongue - Penstemon Arenarius Greene
- Nevada Sumpweed - Chorisiva Nevadensis (M.E. Jones) Rydb.
- Nevada Suncup - Camissonia Nevadensis (Kellogg) P.H. Raven
- Nevada Willowherb - Epilobium Nevadense Munz
- Neverdie - Kalanchoe Integra (Medik.) Kuntze
- Neverdie - Kalanchoe Integra (Medik.) Kuntze var. crenata (Andrews) Cufod.
- Neverdie - Kalanchoe Integra (Medik.) Kuntze var. verea (Jacq.) Cufod.
- Nevin's Barberry - Mahonia Nevinii (A. Gray) Fedde
- Nevin's Bird's-beak - Cordylanthus Nevinii A. Gray
- Nevin's Brickellbush - Brickellia Nevinii A. Gray
- Nevin's Gilia - Gilia Nevinii A. Gray
- Nevin's Woolly Sunflower - Constancea Nevinii (A. Gray) B.G. Baldw.
- Nevius' Garlic - Allium Nevii S. Watson
- Nevius' Stonecrop - Sedum Nevii A. Gray
- New Britain Chastetree - Vitex Novae-pommeraniae Warb.
- New Britain Island Screwpine - Pandanus Baptistii hort. ex Misonne
- New Brunswick Blackberry - Rubus Gulosus L.H. Bailey
- New Caledonia Pine - Araucaria Columnaris (G. Forst.) Hook.
- New England Aster - Symphyotrichum Novae-angliae (L.) G.L. Nesom
- New England Blackberry - Rubus Insons L.H. Bailey
- New England Blackbutt - Eucalyptus Andrewsii Maiden ssp. campanulata (R.T. Baker & H.G. Sm.) L.A.S. Johnson &
- New England Blazing Star - Liatris Scariosa (L.) Willd. var. novae-angliae Lunell
- New England Blue Violet - Viola Novae-angliae House
- New England Bryhnia Moss - Bryhnia Novae-angliae (Sull. & Lesq.) Grout
- New England Bulrush - Bolboschoenus Novae-angliae (Britton) S.G. Sm.
- New England Dewberry - Rubus Novanglicus L.H. Bailey
- New England Fontinalis Moss - Fontinalis Novae-angliae Sull.
- New England Fontinalis Moss - Fontinalis Novae-angliae Sull. var. cymbifolia (Austin) Welch
- New England Fontinalis Moss - Fontinalis Novae-angliae Sull. var. novae-angliae
- New England Hawkweed - Hieracium Sabaudum L.
- New England Justiceweed - Eupatorium Novae-angliae (Fernald ) V.I. Sullivan ex A. Haines & Sorrie
- New England Quillwort - Isoetes ×novae-angliae D.F. Brunt. & D.M. Britton
- New England Sedge - Carex Novae-angliae Schwein.
- New Guinea Teak - Vitex Cofassus Reinw. ex Blume
- New Holland Rattlepod - Crotalaria Novae-hollandiae DC.
- New Jersey Blueberry - Vaccinium Caesariense Mack.
- New Jersey Muhly - Muhlenbergia Torreyana (Schult.) Hitchc.
- New Jersey Rush - Juncus Caesariensis Coville
- New Jersey Tea - Ceanothus Americanus L.
- New London Dewberry - Rubus Positivus L.H. Bailey
- New London Hawthorn - Crataegus Spatiosa Sarg.
- New Mexican Disc Lichen - Buellia Novomexicana de Lesd.
- New Mexican Fontinalis Moss - Fontinalis Neomexicana Sull. & Lesq.
- New Mexican Groundcherry - Physalis Subulata Rydb. var. neomexicana (Rydb.) Waterf. ex Kartesz & Gandhi
- New Mexican Gumweed - Grindelia Arizonica A. Gray var. neomexicana (Wooton & Standl.) G.L. Nesom
- New Mexican Nightshade - Solanum Heterodoxum Dunal var. novomexicanum Bartlett
- New Mexican Nodding Onion - Allium Cernuum Roth var. neomexicanum (Rydb.) J.F. Macbr.
- New Mexican Sarcogyne Lichen - Sarcogyne Novomexicana H. Magn.
- New Mexican Stonecrop - Rhodiola Integrifolia Raf. ssp. neomexicana (Britton) Kartesz
- New Mexican Wart Lichen - Verrucaria Novomexicana de Lesd.
- New Mexico Alumroot - Heuchera Novomexicana Wheelock
- New Mexico Beardtongue - Penstemon Neomexicanus Wooton & Standl.
- New Mexico Beeblossom - Oenothera Coloradensis (Rydb.) W.L. Wagner & Hoch ssp. neomexicana (Wooton) W.L. Wagner
- New Mexico Bird's-foot Trefoil - Lotus Plebeius (Brandegee) Barneby
- New Mexico Bluegrass - Poa Occidentalis Vasey
- New Mexico Cinquefoil - Potentilla Oblanceolata Rydb.
- New Mexico Cliff Fern - Woodsia Neomexicana Windham
- New Mexico Copperleaf - Acalypha Neomexicana Müll. Arg.
- New Mexico Cryptantha - Cryptantha Albida (Kunth) I.M. Johnst.
- New Mexico Evening Primrose - Oenothera Neomexicana (Small) Munz
- New Mexico False Yucca - Hesperaloe Funifera (Lem.) Trel.
- New Mexico Fameflower - Phemeranthus Confertiflorus (Greene) Hershkovitz
- New Mexico Fanpetals - Sida Neomexicana A. Gray
- New Mexico Feathergrass - Hesperostipa Neomexicana (Thurb. ex J.M. Coult.) Barkworth
- New Mexico Figwort - Scrophularia Macrantha Greene ex Stiefelhagen
- New Mexico Fleabane - Erigeron Neomexicanus A. Gray
- New Mexico Goosefoot - Chenopodium Neomexicanum Standl.
- New Mexico Goosefoot - Chenopodium Neomexicanum Standl. var. neomexicanum
- New Mexico Groundsel - Packera Neomexicana (A. Gray) W.A. Weber & Á. Löve
- New Mexico Groundsel - Packera Neomexicana (A. Gray) W.A. Weber & Á. Löve var. mutabilis (Greene) W.A. Webe
- New Mexico Groundsel - Packera Neomexicana (A. Gray) W.A. Weber & Á. Löve var. neomexicana
- New Mexico Locust - Robinia Neomexicana A. Gray
- New Mexico Locust - Robinia Neomexicana A. Gray var. neomexicana
- New Mexico Lupine - Lupinus Neomexicanus Greene
- New Mexico Maple - Acer Glabrum Torr. var. neomexicanum (Greene) Kearney & Peebles
- New Mexico Milkvetch - Astragalus Neomexicanus Wooton & Standl.
- New Mexico Milkwort - Polygala Rectipilis S.F. Blake
- New Mexico Muhly - Muhlenbergia Pauciflora Buckley
- New Mexico Needlegrass - Achnatherum Perplexum Hoge & Barkworth
- New Mexico Orange Lichen - Caloplaca Novomexicana (Fink) ?, ined.?
- New Mexico Phacelia - Phacelia Neomexicana Thurb. ex Torr.
- New Mexico Plumeseed - Rafinesquia Neomexicana A. Gray
- New Mexico Ponysfoot - Dichondra Brachypoda Wooton & Standl.
- New Mexico Raspberry - Rubus Neomexicanus A. Gray
- New Mexico Rim Lichen - Lecanora Novomexicana H. Magn.
- New Mexico Rockdaisy - Perityle Staurophylla (Barneby) Shinners
- New Mexico Rockdaisy - Perityle Staurophylla (Barneby) Shinners var. homoflora T.K. Todsen
- New Mexico Rockdaisy - Perityle Staurophylla (Barneby) Shinners var. staurophylla
- New Mexico Rush - Juncus Interior Wiegand var. neomexicanus (Wiegand) F.J. Herm.
- New Mexico Saltbush - Atriplex ×neomexicana Standl. (pro sp.)
- New Mexico Silverbush - Argythamnia Neomexicana Müll. Arg.
- New Mexico Spanish Bayonet - Yucca Harrimaniae Trel. var. neomexicana (Wooton & Standl.) Reveal
- New Mexico Spiny Milkvetch - Astragalus Kentrophyta A. Gray var. neomexicanus (Barneby) Barneby
- New Mexico Spinystar - Escobaria Vivipara (Nutt.) Buxbaum var. neomexicana (Engelm.) Buxbaum
- New Mexico Starviolet - Hedyotis Vegrandis W.H. Lewis
- New Mexico Stickseed - Hackelia Hirsuta (Wooton & Standl.) I.M. Johnst.
- New Mexico Sunflower - Helianthus Praetermissus E.E. Watson
- New Mexico Tansyaster - Psilactis Asteroides A. Gray
- New Mexico Thistle - Cirsium Neomexicanum A. Gray
- New Mexico Ticktrefoil - Desmodium Neomexicanum A. Gray
- New Mexico Unicorn-plant - Proboscidea Spicata Correll
- New Mexico Xanthoparmelia Lichen - Xanthoparmelia Novomexicana (Gyel.) Hale
- New Mexico Yellow Flax - Linum Neomexicanum Greene
- New Orleans Dewberry - Rubus Sons L.H. Bailey
- New Wyoming Xanthoparmelia Lichen - Xanthoparmelia Neowyomingica Hale
- New York Aster - Symphyotrichum Novi-belgii (L.) G.L. Nesom
- New York Aster - Symphyotrichum Novi-belgii (L.) G.L. Nesom var. elodes (Torr. & A. Gray) G.L. Nesom
- New York Aster - Symphyotrichum Novi-belgii (L.) G.L. Nesom var. novi-belgii
- New York Blackberry - Rubus Noveboracus L.H. Bailey
- New York Dewberry - Rubus Obsessus L.H. Bailey
- New York Fern - Thelypteris Noveboracensis (L.) Nieuwl.
- New York Hawthorn - Crataegus Desueta Sarg.
- New York Ironweed - Vernonia Noveboracensis (L.) Michx.
- New York Mountain Cryptantha - Cryptantha Tumulosa (Payson) Payson
- New Zealand Flax - Phormium Tenax J.R. Forst. & G. Forst.
- New Zealand Geranium - Geranium Retrorsum L'Hér. ex DC.
- New Zealand Hebe - Hebe Speciosa (R. Cunn. ex A. Cunn.) J.C. Andersen
- New Zealand Nightshade - Solanum Aviculare G. Forst.
- New Zealand Red Pine - Dacrydium Cupressinum Sol. ex Lamb.
- New Zealand Spinach - Tetragonia Tetragonioides (Pall.) Kuntze
- Newberry's Cinquefoil - Potentilla Newberryi A. Gray
- Newberry's Hymenopappus - Hymenopappus Newberryi (A. Gray) I.M. Johnst.
- Newberry's Lipfern - Cheilanthes Newberryi (D.C. Eaton) Domin
- Newberry's Milkvetch - Astragalus Newberryi A. Gray
- Newberry's Milkvetch - Astragalus Newberryi A. Gray var. aquarii Isely
- Newberry's Milkvetch - Astragalus Newberryi A. Gray var. blyae (Rose ex Rydb.) Barneby
- Newberry's Milkvetch - Astragalus Newberryi A. Gray var. castoreus M.E. Jones
- Newberry's Milkvetch - Astragalus Newberryi A. Gray var. newberryi
- Newberry's Tickseed - Coreopsis Californica (Nutt.) H. Sharsm. var. newberryi (A. Gray) E.B. Sm.
- Newberry's Twinpod - Physaria Newberryi A. Gray
- Newberry's Twinpod - Physaria Newberryi A. Gray var. newberryi
- Newberry's Twinpod - Physaria Newberryi A. Gray var. racemosa Rollins
- Newberry's Twinpod - Physaria Newberryi A. Gray var. yesicola R.C. Sivinski
- Newberry's Velvetmallow - Horsfordia Newberryi (S. Watson) A. Gray
- Newberry's Yucca - Hesperoyucca Newberryi (McKelvey) Clary
- Newberrya Congesta Torr.
- Newcombe's Butterweed - Sinosenecio Newcombei (Greene) J.P. Janovec & T.M. Barkley
- Newcombe's Saxifrage - Saxifraga Ferruginea Graham var. newcombei Small
- Newfoundland Aster - Symphyotrichum Novi-belgii (L.) G.L. Nesom var. crenifolium (Fernald) J. Labrecque & L. Bro
- Newfoundland Dwarf Birch - Betula Michauxii Sarg.
- Newton's Larkspur - Delphinium Newtonianum D.M. Moore
- Neyraudia - Neyraudia Hook. f.
- Nez Perce Mariposa Lily - Calochortus Macrocarpus Douglas var. maculosus (A. Nelson & J.F. Macbr.) A. Nelson & J.F
- Nezera Imbricata Raf.
- Nezera Striata (Walter) Nieuwl.
- Nezera Virginiana (L.) Nieuwl.
- Ngai Camphor - Blumea Balsamifera (L.) DC.
- Ngaio Tree - Myoporum Laetum G. Forst.
- Ngiwoden - Casearia Hirtella Hosok.
- Ngmui - Stemonurus Ammui (Kanehira) H.L. Sleumer
- Niaouli-tree - Melaleuca Viridiflora Sol. ex Gaertn.
- Niaragato - Zanthoxylum Spinifex (Jacq.) DC.
- Nicandra - Nicandra Adans.
- Nicaraguan Fountaingrass - Pennisetum Complanatum (Nees) Hemsl.
- Nichol's Echinocactus - Echinocactus Horizonthalonius Lem. var. nicholii L.D. Benson
- Nichol's Hedgehog Cactus - Echinocereus Nicholii (L.D. Benson) Parfitt
- Nicholson's Didymodon Moss - Didymodon Vinealis (Brid.) R.H. Zander var. nicholsonii (Culm.) R.H. Zander
- Nickels' Cactus - Coryphantha Nickelsiae (K. Brandegee) Britton & Rose
- Nicker Bean - Entada Gigas (L.) Fawc. & Rendle
- Nicker - Caesalpinia L.
- Nicolaia Elatior (Jack) Horan.
- Nicoteba Betonica (L.) Lindau
- Nicotiana Affinis T. Moore
- Nicotiana Alata Link & Otto var. grandiflora Comes
- Nicotiana Bigelovii (Torr.) S. Watson
- Nicotiana Bigelovii (Torr.) S. Watson var. multivalvis (Lindl.) Eastw.
- Nicotiana Bigelovii (Torr.) S. Watson var. quadrivalvis (Pursh) Eastw.
- Nicotiana Bigelovii (Torr.) S. Watson var. wallacei A. Gray
- Nicotiana Palmeri A. Gray
- Nicotiana Quadrivalvis Pursh var. multivalvis A. Gray, nom. inq.
- Nicotiana Trigonophylla Dunal
- Nicotiana Trigonophylla Dunal var. palmeri (A. Gray) M.E. Jones
- Nidema - Nidema Britton & Millsp.
- Niebla Caespitosa Spjut
- Niebla Cephalota (Tuck.) Rundel & Bowler
- Niebla Ceruchoides Rundel & Bowler
- Niebla Combeoides (Nyl.) Rundel & Bowler
- Niebla Cornea Spjut
- Niebla Dactylifera Spjut
- Niebla Disrupta (Nyl.) Spjut
- Niebla Dissecta Spjut
- Niebla Eburnea Spjut
- Niebla Fimbriata Spjut
- Niebla Flagelliforma Spjut
- Niebla Halei Spjut
- Niebla Infundibula Spjut
- Niebla Isidiascens Bowler, Marsh, T. Nash & Riefner
- Niebla Laevigata Rundel & Bowler
- Niebla Laminaria Spjut
- Niebla Lichen - Niebla Homalea (Ach.) Rundel & Bowler
- Niebla Lichen - Niebla Rundel & Bowler
- Niebla Palmeri Spjut
- Niebla Polymorpha Bowler, J.E. Marsh, T.H. Nash & Riefner
- Niebla Procera Rundel & Bowler
- Niebla Ramosissima Spjut
- Niebla Robusta (R. Howe) Rundel & Bowler
- Niebla Siphonoloba Spjut
- Niebla Sorediata Spjut
- Niebla Sorocarpia Spjut
- Niebla Testudinaria (Nyl.) Spjut
- Niebla Tuberculata Riefner, Bowler, J.E. Marsh & T.H. Nash
- Niebla Undulata Spjut
- Nierembergia Frutescens Durieu
- Nierembergia Viscosa Torr.
- Nieuwland's Blazing Star - Liatris Scariosa (L.) Willd. var. nieuwlandii (Lunell) E.G. Voss
- Nigaki - Picrasma Quassioides (D. Don) Benn.
- Nigella - Nigella L.
- Niger Copal Tree - Daniellia Thurifera Benn.
- Nigerian Stylo - Stylosanthes Erecta P. Beauv.
- Night And Afternoon - Pseuderanthemum Variabile (R. Br.) Radlk.
- Night Jessamine - Cestrum Nocturnum L.
- Night Scented Orchid - Epidendrum Nocturnum Jacq.
- Night Scented Stock - Matthiola Longipetala (Vent.) DC.
- Nightblooming Cactus - Hylocereus (a. Berger) Britton & Rose
- Nightblooming Cactus - Hylocereus Undatus (Haw.) Britton & Rose
- Nightblooming Cereus - Peniocereus Greggii (Engelm.) Britton & Rose
- Nightblooming Cereus - Peniocereus Greggii (Engelm.) Britton & Rose var. greggii
- Nightblooming Cereus - Peniocereus Greggii (Engelm.) Britton & Rose var. transmontanus (Engelm.) Backeb.
- Nightblooming False Bindweed - Calystegia Atriplicifolia Hallier f.
- Nightblooming False Bindweed - Calystegia Atriplicifolia Hallier f. ssp. atriplicifolia
- Nightblooming False Bindweed - Calystegia Atriplicifolia Hallier f. ssp. buttensis Brummitt
- Nightcaps - Anemone Quinquefolia L. var. minima (DC.) Frodin
- Nightcaps - Anemone Quinquefolia L. var. quinquefolia
- Nightflowering Silene - Silene Noctiflora L.
- Nightflowering Wild Petunia - Ruellia Noctiflora (Nees) A. Gray
- Nightshade - Solanum Demissum Lindl.
- Nightshade - Solanum Ferox L.
- Nightshade - Solanum Incanum L.
- Nightshade - Solanum Khasianum C.B. Clarke
- Nightshade - Solanum L.
- Nightshade - Solanum Macrocarpon L.
- Nightshade - Solanum Phureja Juz. & Buk.
- Nightshade - Solanum Umbellatum Mill.
- Nigua - Cornutia Obovata Urb.
- Niguita - Tournefortia Bicolor Sw.
- Nihoa Pritchardia - Pritchardia Aylmer-robinsonii H. St. John
- Nihoa Pritchardia - Pritchardia Glabrata Becc. & Rock
- Nihoa Pritchardia - Pritchardia Napaliensis H. St. John
- Nihoa Pritchardia - Pritchardia Remota Becc.
- Niihau Delissea - Delissea Niihauensis H. St. John ssp. niihauensis
- Niihau Lobelia - Lobelia Niihauensis H. St. John
- Niihau Panicgrass - Panicum Niihauense H. St. John
- Niihau Schiedea - Schiedea Amplexicaulis H. Mann
- Nikko Fir - Abies Homolepis Siebold & Zucc.
- Nile Grass - Acroceras Macrum Stapf
- Nilgiri Disperis - Disperis Neilgherrensis Wight
- Nimblewill - Muhlenbergia Schreberi J.F. Gmel.
- Nine Mile Canyon Phacelia - Phacelia Novenmillensis Munz
- Nineanther Prairie Clover - Dalea Enneandra Nutt.
- Nineawn Pappusgrass - Enneapogon Desvauxii Desv. ex P. Beauv.
- Ninebark - Physocarpus (camb.) Raf.
- Nineleaf Biscuitroot - Lomatium Triternatum (Pursh) J.M. Coult. & Rose
- Nineleaf Biscuitroot - Lomatium Triternatum (Pursh) J.M. Coult. & Rose var. brevifolium (J.M. Coult. & Rose)
- Nineleaf Biscuitroot - Lomatium Triternatum (Pursh) J.M. Coult. & Rose var. macrocarpum (J.M. Coult. & Rose)
- Nineleaf Biscuitroot - Lomatium Triternatum (Pursh) J.M. Coult. & Rose var. triternatum
- Nino De Cota - Laplacea Portoricensis (Krug & Urb.) Dyer
- Nintooa Japonica (Thunb.) Sweet
- Niobe Caerulea (Andrews) Nash
- Niobe Coerulea (Andrews) Nash, orth. var.
- Niobe Japonica (Thunb.) Nash
- Nioi - Eugenia Koolauensis O. Deg.
- Niopa Peregrina (L.) Britton & Rose
- Nipa Palm - Nypa Fruticans Wurmb
- Nipomo Mesa Lupine - Lupinus Nipomensis Eastw.
- Nipple Beach Phacelia - Phacelia Mammillarensis N.D. Atwood
- Nipple Beehive Cactus - Coryphantha Macromeris (Engelm.) Lem.
- Nipple Beehive Cactus - Coryphantha Macromeris (Engelm.) Lem. var. macromeris
- Nipplebract Arrowhead - Sagittaria Papillosa Buchenau
- Nipplefruit - Solanum Mammosum L.
- Nipplewort - Lapsana L.
- Nipplewort - Lapsanastrum J.k. Pak & K. Bremer
- Nippon Bells - Shortia Uniflora Maxim.
- Nippon Daisy - Nipponanthemum (kitam.) Kitam.
- Nippon Daisy - Nipponanthemum Nipponicum (Franch. ex Maxim.) Kitam.
- Niruri - Phyllanthus Debilis Klein ex Willd.
- Nishida's Ventilago - Ventilago Nisidae Kaneh.
- Nisperillo - Manilkara Valenzuela (A. Rich.) T.D. Penn.
- Nispero Cimarron - Symplocos Lanata Krug & Urb.
- Nissenan Manzanita - Arctostaphylos Nissenana Merriam
- Nit Grass - Gastridium P. Beauv.
- Nit Grass - Gastridium Phleoides (Nees & Meyen) C.E. Hubbard
- Nitbearing Lipfern - Cheilanthes Lendigera (Cav.) Sw.
- Niterwort - Nitrophila S. Watson
- Nitrogen Moss - Tetraplodon Bruch & Schimp.
- Nits And Lice - Hypericum Drummondii (Grev. & Hook.) Torr. & A. Gray
- Nitschke's Dot Lichen - Micarea Nitschkeana (J. Lahm ex Rabenh.) Harm.
- Niu Valley Cyrtandra - Cyrtandra Polyantha C.B. Clarke
- Nixon's Hawthorn - Crataegus Nananixonii Phipps & R. O'Kennon
- Noble Fir - Abies Procera Rehder
- Noble Yarrow - Achillea Nobilis L.
- Nocca Mollis (Cav.) Jacq.
- Noccaea Californica (S. Watson) Kartesz, ined.
- Noccaea Cochleariformis (DC.) Á. Löve & D. Löve [excluded]
- Noccaea Coloradensis (Rydb.) Holub
- Noccaea Idahoensis (Payson) Kartesz var. aileeniae (Rollins) Kartesz, ined.
- Noccaea Idahoensis (Payson) Kartesz var. idahoensis (Payson) Kartesz, ined.
- Noccaea Idahoensis (Payson) Kartesz, ined.
- Noccaea Montana (L.) F.K. Mey. ssp. arctica (A.E. Porsild) Á. Löve & D. Löve
- Noccaea Montana (L.) F.K. Mey. var. fendleri (A. Gray) Kartesz, ined.
- Noccaea Montana (L.) F.K. Mey. var. montana
- Noccaea Montana (L.) F.K. Mey. var. siskiyouensis (P.K. Holmgren) Kartesz, ined.
- Nodding Arnica - Arnica Lessingii Greene
- Nodding Barren Strawberry - Waldsteinia Pendula (Urb.) Mez
- Nodding Beaksedge - Rhynchospora Inexpansa (Michx.) Vahl
- Nodding Beardtongue - Penstemon Laxiflorus Pennell
- Nodding Beggartick - Bidens Cernua L.
- Nodding Bird's-beak - Cordylanthus Laxiflorus A. Gray
- Nodding Blue-eyed Grass - Sisyrinchium Cernuum (E.P. Bicknell) Kearney
- Nodding Bluegrass - Poa Reflexa Vasey & Scribn. ex Vasey
- Nodding Bluet - Houstonia Subviscosa (C. Wright ex A. Gray) A. Gray
- Nodding Brome - Bromus Anomalus Rupr. ex Fourn.
- Nodding Broomrape - Orobanche Cernua Loefl. [excluded]
- Nodding Buckwheat - Eriogonum Cernuum Nutt.
- Nodding Buckwheat - Eriogonum Cernuum Nutt. var. cernuum
- Nodding Buckwheat - Eriogonum Cernuum Nutt. var. viminale (S. Stokes) Reveal
- Nodding Catchfly - Silene Pendula L.
- Nodding Chickweed - Cerastium Nutans Raf.
- Nodding Chickweed - Cerastium Nutans Raf. var. nutans
- Nodding Chickweed - Cerastium Nutans Raf. var. obtectum Kearney & Peebles
- Nodding Clover - Trifolium Cernuum Brot.
- Nodding Clubmoss - Huperzia Nutans (Brack.) Rothm.
- Nodding Coneflower - Isopogon Teretifolius R. Br.
- Nodding Evening Primrose - Oenothera Nutans Atk. & Bartlett
- Nodding Fescue - Festuca Subverticillata (Pers.) Alexeev
- Nodding Fimbry - Fimbristylis Nutans (Retz.) Vahl
- Nodding Hypecoum - Hypecoum Pendulum L.
- Nodding Lady's Tresses - Spiranthes Cernua (L.) Rich.
- Nodding Locoweed - Oxytropis Deflexa (Pall.) DC.
- Nodding Locoweed - Oxytropis Deflexa (Pall.) DC. var. foliolosa (Hook.) Barneby
- Nodding Locoweed - Oxytropis Deflexa (Pall.) DC. var. pulcherrima S.L. Welsh & A. Huber
- Nodding Madia - Harmonia Nutans (Greene) B.G. Baldw.
- Nodding Microseris - Microseris Nutans (Hook.) Sch. Bip.
- Nodding Milkweed - Asclepias Glaucescens Kunth
- Nodding Muhly - Muhlenbergia Bushii Pohl
- Nodding Needlegrass - Nassella Cernua (Stebbins & R.M. Love) Barkworth
- Nodding Nixie - Apteria Aphylla (Nutt.) Barnhart ex Small
- Nodding Onion - Allium Cernuum Roth
- Nodding Onion - Allium Cernuum Roth var. cernuum
- Nodding Onion - Allium Cernuum Roth var. obtusum Cockerell ex J.F. Macbr.
- Nodding Pinweed - Lechea Cernua Small
- Nodding Plumeless Thistle - Carduus Nutans L.
- Nodding Ragwort - Senecio Bigelovii A. Gray
- Nodding Ragwort - Senecio Bigelovii A. Gray var. bigelovii
- Nodding Rattlesnakeroot - Prenanthes Crepidinea Michx.
- Nodding Rockcress - Arabis Demissa Greene
- Nodding Rockcress - Arabis Demissa Greene var. demissa
- Nodding Rockcress - Arabis Demissa Greene var. languida Rollins
- Nodding Sage - Salvia Nutans L.
- Nodding Saxifrage - Saxifraga Cernua L.
- Nodding Sedge - Carex Gynandra Schwein.
- Nodding Semaphoregrass - Pleuropogon Refractus (A. Gray) Benth. ex Vasey
- Nodding Stickseed - Hackelia Deflexa (Wahlenb.) Opiz
- Nodding Strap Airplant - Catopsis Nutans (Sw.) Griseb.
- Nodding Sunray - Encelia Nutans Eastw.
- Nodding Thelypody - Thelypodium Flexuosum B.L. Rob.
- Nodding Wakerobin - Trillium Flexipes Raf.
- Nodding Waternymph - Najas Flexilis (Willd.) Rostk. & Schmidt
- Nodding Wild Coffee - Psychotria Deflexa DC.
- Noddingcaps - Triphora Nutt.
- Nodeless Danafern - Danaea Nodosa (L.) Sm.
- Nodeweed - Synedrella Nodiflora (L.) Gaertn.
- Nodobryoria Abbreviata (Müll. Arg.) Common & Brodo
- Nodobryoria Common & Brodo
- Nodobryoria Oregana (Tuck.) Common & Brodo
- Nodobryoria Subdivergens (E. Dahl) Common & Brodo
- Nodule Cracked Lichen - Acarospora Nodulosa (Dufour) Hue
- Nodule Cracked Lichen - Acarospora Nodulosa (Dufour) Hue var. nodulosa
- Noel's Owl's-clover - Orthocarpus Tolmiei Hook. & Arn. ssp. holmgreniorum T.I. Chuang & Heckard
- Nohoanu - Geranium Hillebrandii Aedo & Muñoz-Garm.
- Nolina Affinis Trel.
- Nolina Bigelovii (Torr.) S. Watson var. parryi (S. Watson) L.D. Benson
- Nolina Bigelovii (Torr.) S. Watson var. wolfii (Munz) L.D. Benson
- Nolina Parryi S. Watson ssp. wolfii Munz
- Nolina Texana S. Watson var. compacta (Trel.) I.M. Johnst.
- Nolina Wolfii (Munz) Munz
- Nomaphila - Nomaphila Blume
- Nonesuch Daffodil - Narcissus ×incomparabilis Mill. (pro sp.)
- Noni Kuahiwi - Morinda Trimera Hillebr.
- Nootka Alkaligrass - Puccinellia Nutkaensis (J. Presl) Fernald & Weath.
- Nootka Cypress - Callitropsis Oerst.
- Nootka Lupine - Lupinus Nootkatensis Donn ex Sims
- Nootka Lupine - Lupinus Nootkatensis Donn ex Sims var. fruticosus Sims
- Nootka Lupine - Lupinus Nootkatensis Donn ex Sims var. nootkatensis
- Nootka Rose - Rosa Nutkana C. Presl
- Nootka Rose - Rosa Nutkana C. Presl var. muriculata (Greene) G.N. Jones
- Nootka Rose - Rosa Nutkana C. Presl var. nutkana
- Nootka Rose - Rosa Nutkana C. Presl var. setosa G.N. Jones
- Nopalea Cochenillifera (L.) Salm-Dyck
- Nordenskioeld's Rim Lichen - Lecanora Nordenskioeldii Vain.
- Norfolk Island Pine - Araucaria Heterophylla (Salisb.) Franco
- Noronhia - Noronhia (stadmam) Thouars
- Norta Altissima (L.) Britton
- Norta Irio (L.) Britton
- North Africa Grass - Ventenata Dubia (Leers) Coss.
- North Africa Grass - Ventenata Koeler
- North African Catchfly - Silene Pseudatocion Desf.
- North African Knapweed - Centaurea Diluta Aiton
- North Coast Phacelia - Phacelia Insularis Munz var. continentis J.T. Howell
- North Coast Semaphoregrass - Pleuropogon Hooverianus (L.D. Benson) J.T. Howell
- North Fork Heartleaf - Hexastylis Rhombiformis Gaddy
- North Idaho Monkeyflower - Mimulus Clivicola Greenm.
- North Pacific Draba - Draba Hyperborea (L.) Desv.
- North Umpqua Kalmiopsis - Kalmiopsis Fragrans Meinke & Kaye
- North Umpqua Kalmiopsis - Kalmiopsis Leachiana (L.F. Hend.) Rehder
- North's False Flag - Neomarica Northiana (Schneev.) Sprague
- Northeastern Dewberry - Rubus Fraternalis L.H. Bailey
- Northeastern Saltbush - Atriplex Glabriuscula Edmondston var. glabriuscula
- Northeastern Sedge - Carex Cryptolepis Mack.
- Northern Adderstongue - Ophioglossum Pusillum Raf.
- Northern Asphodel - Tofieldia Coccinea Richardson
- Northern Bayberry - Morella Pensylvanica (Mirb.) Kartesz
- Northern Beantree - Bauhinia Carronii F. Muell.
- Northern Bedstraw - Galium Boreale L.
- Northern Bentgrass - Agrostis Mertensii Trin.
- Northern Birch - Betula Borealis Spach
- Northern Birch - Betula ×neoborealis Lepage
- Northern Biscuitroot - Lomatium Farinosum (Hook.) J.M. Coult. & Rose
- Northern Biscuitroot - Lomatium Farinosum (Hook.) J.M. Coult. & Rose var. farinosum
- Northern Black Currant - Ribes Hudsonianum Richardson
- Northern Blue Monkshood - Aconitum Noveboracense A. Gray ex Coville
- Northern Blue-eyed Grass - Sisyrinchium Septentrionale E.P. Bicknell
- Northern Bluebells - Mertensia Paniculata (Aiton) G. Don var. borealis (J.F. Macbr.) L.O. Williams
- Northern Blueberry - Vaccinium Boreale I.V. Hall & Aalders
- Northern Bluegrass - Poa Stenantha Trin.
- Northern Bluethread - Burmannia Biflora L.
- Northern Bog Aster - Symphyotrichum Boreale (Torr. & A. Gray) Á. Löve & D. Löve
- Northern Bog Bedstraw - Galium Labradoricum (Wiegand) Wiegand
- Northern Bog Clubmoss - Lycopodiella Subappressa J.G. Bruce, W.H. Wagner & Beitel
- Northern Bog Sedge - Carex Gynocrates Wormsk. ex Drejer
- Northern Bog Violet - Viola Nephrophylla Greene
- Northern Bowl Lichen - Psoroma Tenue Henssen var. borealis Henssen
- Northern Bugleweed - Lycopus Uniflorus Michx.
- Northern Bugleweed - Lycopus Uniflorus Michx. var. uniflorus
- Northern Bur-reed - Sparganium Hyperboreum Beurling ex Laest.
- Northern Bush Honeysuckle - Diervilla Lonicera Mill.
- Northern Buttercup - Ranunculus Pedatifidus Sm. var. affinis (R. Br.) L.D. Benson
- Northern California Walnut - Juglans Hindsii (Jeps.) Jeps. ex R.E. Sm.
- Northern Catalpa - Catalpa Speciosa (Warder) Warder ex Engelm.
- Northern Channel Islands Phacelia - Phacelia Insularis Munz var. insularis
- Northern Clarkia - Clarkia Borealis E. Small
- Northern Clarkia - Clarkia Borealis E. Small ssp. borealis
- Northern Cluster Sedge - Carex Arcta Boott
- Northern Coastal Violet - Viola Brittoniana Pollard
- Northern Coastal Violet - Viola Brittoniana Pollard var. brittoniana
- Northern Coastal Violet - Viola Brittoniana Pollard var. pectinata (E.P. Bicknell) Alexander
- Northern Dandelion - Taraxacum Phymatocarpum J. Vahl
- Northern Dewberry - Rubus Flagellaris Willd.
- Northern Evening Primrose - Oenothera Parviflora L.
- Northern Eyebright - Euphrasia Micrantha Rchb.
- Northern False Candytuft - Smelowskia Borealis (Greene) Drury & Rollins var. borealis
- Northern False Candytuft - Smelowskia Borealis (Greene) Drury & Rollins var. koliana (Gombócz) Drury & Rollins
- Northern False Coolwort - Bolandra Oregana S. Watson
- Northern Fescue - Festuca Viviparoidea Krajina ex Pavlick
- Northern Fescue - Festuca Viviparoidea Krajina ex Pavlick ssp. krajinae Frederiksen
- Northern Fescue - Festuca Viviparoidea Krajina ex Pavlick ssp. viviparoidea
- Northern Freckled Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. albifolius M.E. Jones
- Northern Funaria Moss - Funaria Polaris Bryhn
- Northern Golden Saxifrage - Chrysosplenium Tetrandrum (Lund ex Malmgr.) Th. Fr.
- Northern Gray Ironbark - Eucalyptus Siderophloia Benth.
- Northern Green Orchid - Platanthera Aquilonis Sheviak
- Northern Green Orchid - Platanthera Hyperborea (L.) Lindl.
- Northern Green Rush - Juncus Alpinoarticulatus Chaix
- Northern Green Rush - Juncus Alpinoarticulatus Chaix ssp. nodulosus (Wahlenb.) Hämet-Ahti
- Northern Groundcone - Boschniakia Rossica (Cham. & Schltdl.) Fedtsch.
- Northern Groundsel - Packera Hyperborealis (Greenm.) Á. Löve & D. Löve
- Northern Hawthorn - Crataegus Dissona Sarg.
- Northern Hollyfern - Polystichum Lonchitis (L.) Roth
- Northern Hygrohypnum Moss - Hygrohypnum Polare (Lindb.) Loeske
- Northern Idaho Biscuitroot - Lomatium Orientale J.M. Coult. & Rose
- Northern Indian Paintbrush - Castilleja Hyperborea Pennell
- Northern Jacob's-ladder - Polemonium Boreale M.F. Adams
- Northern Jacob's-ladder - Polemonium Boreale M.F. Adams ssp. boreale
- Northern Jacob's-ladder - Polemonium Boreale M.F. Adams ssp. macranthum (Cham.) Hultén
- Northern Kittentails - Synthyris Borealis Pennell
- Northern Larkspur - Delphinium Brachycentrum Ledeb.
- Northern Lecidea Lichen - Lecidea Polaris Lynge
- Northern Licorice-root - Ligusticum Verticillatum (Hook.) J.M. Coult. & Rose ex Rose
- Northern Linanthus - Leptosiphon Septentrionalis (H. Mason) J.M. Porter & L.A. Johnson
- Northern Long Sedge - Carex Folliculata L.
- Northern Maidenhair - Adiantum Pedatum L.
- Northern Marsh Yellowcress - Rorippa Islandica (Oeder) Borbás
- Northern Meadowsweet - Spiraea Septentrionalis (Fernald) Á. Löve & D. Löve
- Northern Microseris - Microseris Borealis (Bong.) Sch. Bip.
- Northern Moonwort - Botrychium Boreale Milde
- Northern Moonwort - Botrychium Pinnatum H. St. John
- Northern Mountain Ash - Sorbus Decora (Sarg.) C.K. Schneid.
- Northern Mountain Cranberry - Vaccinium Vitis-idaea L. ssp. minus (Lodd.) Hultén
- Northern Needleleaf - Tillandsia Balbisiana Schult. & Schult. f.
- Northern Orange Lichen - Caloplaca Montana de Lesd.
- Northern Panicgrass - Dichanthelium Boreale (Nash) Freckmann
- Northern Phlox - Phlox Adsurgens Torr. ex A. Gray
- Northern Pin Oak - Quercus Ellipsoidalis E.J. Hill
- Northern Pore Lichen - Pertusaria Borealis Erichsen
- Northern Primrose - Primula Borealis Duby
- Northern Purple Pitcherplant - Sarracenia Purpurea L. ssp. purpurea var. purpurea
- Northern Red Oak - Quercus Rubra L.
- Northern Red Oak - Quercus Rubra L. var. ambigua (A. Gray) Fernald
- Northern Red Oak - Quercus Rubra L. var. rubra
- Northern Reedgrass - Calamagrostis Stricta (Timm) Koeler ssp. inexpansa (A. Gray) C.W. Greene
- Northern Rimmed Lichen - Aspicilia Nordlandica (H. Magn.) Degel.
- Northern Rockcress - Neotorularia Hedge & J. Léonard
- Northern Ryegrass - Elymus Hirsutus J. Presl
- Northern Sanicle - Sanicula Graveolens Poepp. ex DC.
- Northern Sedge - Carex Deflexa Hornem.
- Northern Selaginella - Selaginella Rupestris (L.) Spring
- Northern Shorthusk - Brachyelytrum Aristosum (Michx.) Trel.
- Northern Singlespike Sedge - Carex Scirpoidea Michx.
- Northern Singlespike Sedge - Carex Scirpoidea Michx. ssp. convoluta (Kük.) Dunlop
- Northern Singlespike Sedge - Carex Scirpoidea Michx. ssp. scirpoidea
- Northern Singlespike Sedge - Carex Scirpoidea Michx. ssp. stenochlaena (T. Holm) Á. Löve & D. Löve
- Northern Slender Lady's Tresses - Spiranthes Lacera (Raf.) Raf.
- Northern Slender Lady's Tresses - Spiranthes Lacera (Raf.) Raf. var. gracilis (Bigelow) Luer
- Northern Slender Lady's Tresses - Spiranthes Lacera (Raf.) Raf. var. lacera
- Northern Small Limestone Moss - Seligeria Polaris Berggr.
- Northern Spicebush - Lindera Benzoin (L.) Blume
- Northern Spicebush - Lindera Benzoin (L.) Blume var. benzoin
- Northern Spicebush - Lindera Benzoin (L.) Blume var. pubescens (Palmer & Steyerm.) Rehder
- Northern Spiderlily - Hymenocallis Occidentalis (Leconte) Kunth
- Northern Spiderlily - Hymenocallis Occidentalis (Leconte) Kunth var. occidentalis
- Northern St. Johnswort - Hypericum Boreale (Britton) E.P. Bicknell
- Northern Starwort - Stellaria Calycantha (Ledeb.) Bong.
- Northern Sweetgrass - Hierochloe Hirta (Schrank) Borbás
- Northern Sweetgrass - Hierochloe Hirta (Schrank) Borbás ssp. arctica (J. Presl) G. Weim.
- Northern Sweetgrass - Hierochloe Hirta (Schrank) Borbás ssp. hirta (Schrank) Borbás [excluded]
- Northern Sweetvetch - Hedysarum Boreale Nutt. ssp. mackenziei (Richardson) S.L. Welsh
- Northern Tansymustard - Descurainia Sophioides (Fisch. ex Hook.) O.E. Schulz
- Northern Twayblade - Listera Borealis Morong
- Northern Water Plantain - Alisma Triviale Pursh
- Northern Water-starwort - Callitriche Hermaphroditica L.
- Northern Watermeal - Wolffia Borealis (Engelm. ex Hegelm.) Landolt ex Landolt & Wildi
- Northern White Rush - Juncus Albescens (Lange) Fernald
- Northern Wildrice - Zizania Palustris L.
- Northern Wildrice - Zizania Palustris L. var. interior (Fassett) Dore
- Northern Wildrice - Zizania Palustris L. var. palustris
- Northern Willow - Salix Arctophila Cockerell ex A. Heller
- Northern Willowherb - Epilobium Septentrionale (D.D. Keck) R.N. Bowman & Hoch
- Northern Woodland Violet - Viola Septentrionalis Greene
- Northern Woodrush - Luzula Confusa Lindeberg
- Northern Yelloweyed Grass - Xyris Montana Ries
- Northern-rockcress - Braya Sternb. & Hoppe
- Northland Cottonsedge - Eriophorum Brachyantherum Trautv. & C.A. Mey.
- Northland Cottonsedge - Eriophorum Brachyantherum Trautv. & C.A. Mey. var. brachyantherum
- Northpark Phacelia - Phacelia Formosula Osterh.
- Northwest Sandbar Willow - Salix Sessilifolia Nutt.
- Northwest Territory Sedge - Carex Utriculata Boott
- Northwestern Groundsel - Packera Contermina (Greenm.) J.F. Bain
- Northwestern Indian Paintbrush - Castilleja Angustifolia (Nutt.) G. Don
- Northwestern Indian Paintbrush - Castilleja Angustifolia (Nutt.) G. Don var. angustifolia
- Northwestern Indian Paintbrush - Castilleja Angustifolia (Nutt.) G. Don var. dubia A. Nelson
- Northwestern Indian Paintbrush - Castilleja Angustifolia (Nutt.) G. Don var. flavescens (Pennell ex Edwin) N.H. Holmgren
- Northwestern Mannagrass - Glyceria ×occidentalis (Piper) J.C. Nelson
- Northwestern Sedge - Carex Concinnoides Mack.
- Northwestern Thelypody - Thelypodium Paniculatum A. Nelson
- Northwestern Twayblade - Listera Caurina Piper
- Northwestern Yellowflax - Sclerolinon Digynum (A. Gray) C.M. Rogers
- Norton's St. Johnswort - Hypericum Scouleri Hook. ssp. nortoniae (M.E. Jones) J.M. Gillett
- Norway Bryoxiphium Moss - Bryoxiphium Norvegicum (Brid.) Mitt.
- Norway Hygrohypnum Moss - Hygrohypnum Norvegicum (Schimp.) Amann
- Norway Maple - Acer Platanoides L.
- Norway Sedge - Carex Norvegica Retz.
- Norway Sedge - Carex Norvegica Retz. ssp. norvegica
- Norway Spruce - Picea Abies (L.) Karst.
- Norwegia Angelica - Angelica Archangelica L. ssp. norvegica (Rupr.) Nordh.
- Norwegian Angelica - Angelica Archangelica L.
- Norwegian Arctic Cudweed - Omalotheca Norvegica (Gunnerus) Schultz-Bipontinus & F.W. Schultz
- Norwegian Cinquefoil - Potentilla Norvegica L.
- Norwegian Cinquefoil - Potentilla Norvegica L. ssp. monspeliensis (L.) Asch. & Graebn.
- Norwegian Cinquefoil - Potentilla Norvegica L. ssp. norvegica
- Norwegian Draba - Draba Norvegica Gunnerus
- Norwegian Draba - Draba Norvegica Gunnerus var. norvegica
- Norwegian Map Lichen - Rhizocarpon Norvegicum Rasanen
- Norwegian Ragged Lichen - Platismatia Norvegica (Lynge) W.L. Culb. & C.F. Culb.
- Norwegian Timmia Moss - Timmia Norvegica J.E. Zetterst.
- Norwegian Timmia Moss - Timmia Norvegica J.E. Zetterst. var. excurrens Bryhn
- Norwegian Timmia Moss - Timmia Norvegica J.E. Zetterst. var. norvegica
- Norwegian Tortula Moss - Tortula Norvegica (F. Weber) Wahlenb. ex Lindb.
- Norwegian Whitlowgrass - Draba Norvegica Gunnerus var. clivicola (Fernald) B. Boivin
- Nose Skullcap - Scutellaria Antirrhinoides Benth.
- Noseburn - Tragia L.
- Nosegaytree - Plumeria Alba L.
- Notable Wattle - Acacia Notabilis F. Muell.
- Notaris' Soot Lichen - Cyphelium Notarisii (Tul.) Blomb. & Forss.
- Notched Cowpea - Vigna Marina (Burm. f.) Merr.
- Notchleaf Clover - Trifolium Bifidum A. Gray
- Nothocestrum Breviflorum A. Gray var. longipes Hillebr.
- Nothocestrum Brevifolium A. Gray var. rupilosum B.C. Stone
- Nothocestrum Inconcinnum H. St. John
- Nothocestrum Longifolium A. Gray var. brevifolium Hillebr.
- Nothocestrum Longifolium A. Gray var. rufipilosum B.C. Stone
- Nothocestrum Subcordatum H. Mann
- Nothochelone - Nothochelone (a. Gray) Straw
- Nothoholcus Lanatus (L.) Nash
- Notholaena Aurea (Poir.) Desv.
- Notholaena Californica D.C. Eaton ssp. nigrescens Ewan
- Notholaena Candida (M. Martens & Galeotti) Hook. var. accessita Jeps.
- Notholaena Candida (M. Martens & Galeotti) Hook. var. copelandii (C.C. Hall) R. Try
- Notholaena Cochisensis Goodding
- Notholaena Dealbata (Pursh) Kunze
- Notholaena Fendleri Kunze
- Notholaena Incana C. Presl
- Notholaena Integerrima (Hook.) Hevly
- Notholaena Jonesii Maxon
- Notholaena Limitanea Maxon
- Notholaena Limitanea Maxon ssp. mexicana Maxon
- Notholaena Limitanea Maxon var. mexicana (Maxon) Broun
- Notholaena Nealleyi Seaton ex J.M. Coult. var. mexicana Davenport
- Notholaena Newberryi D.C. Eaton
- Notholaena Parryi D.C. Eaton
- Notholaena Parvifolia R. Tryon
- Notholaena Schaffneri (Fourn.) Underw. ex Davenport [excluded]
- Notholaena Schaffneri (Fourn.) Underw. ex Davenport var. mexicana (Davenport) Davenpor
- Notholaena Schaffneri (Fourn.) Underw. ex Davenport var. nealleyi (Seaton ex J.M. Coul
- Notholaena Sinuata (Lag. ex Sw.) Kaulf.
- Notholaena Sinuata (Lag. ex Sw.) Kaulf. var. cochisensis (Goodding) Weath.
- Notholaena Sinuata (Lag. ex Sw.) Kaulf. var. integerrima Hook.
- Nothopanax Fruticosus (L.) Miq.
- Nothopanax Pinnatus (Lam.) Miq.
- Nothoscordum Fragrans (Vent.) Kunth
- Nothoscordum Fragrans auct. non (Vent.) Kunth
- Nothoscordum Gracile Stearn, non (Aiton) Stearn
- Nothoscordum Inodorum (Aiton) G. Nicholson
- Nothoscordum Inodorum auct. non (Aiton) G. Nicholson
- Notocactus - Notocactus (k.m. Schum.) Backeb. & F.M. Knuth
- Notocactus Tabularis (Monv.) N.P. Taylor
- Notothylas Amazonica Spruce
- Notothylas Angolensis Steph.
- Notothylas Cubana Steph.
- Notothylas Decurva (Mitt.) Steph.
- Notothylas Fertilis (Milde) Milde
- Notothylas Japonica Horik.
- Notothylas Melanospora Sull.
- Notothylas - Notothylas Sull.
- Notothylas Orbicularis (Schwein.) Sull. var. orbicularis
- Notothylas Orbicularis (Schwein.) Sull. var. pseudotemperata R.M. Schust.
- Notothylas Valvata Sull.
- Nototrichium Humile Hillebr. var. parvifolium O. Deg. & Sherff
- Nototrichium Humile Hillebr. var. subrhomboideum Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. decipiens Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. dubium Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. forbesii Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. helleri Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. kauaiense (A. Gray) Hillebr.
- Nototrichium Sandwicense (A. Gray) Hillebr. var. kolekolense Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. lanaiense Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. lanceolatum Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. latifolium Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. leptopodum O. Deg. & Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. longispicatum Hillebr.
- Nototrichium Sandwicense (A. Gray) Hillebr. var. macrophyllum Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. mauiense O. Deg. & Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. niihauense H. St. John
- Nototrichium Sandwicense (A. Gray) Hillebr. var. olokeleanum Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. pulchelloides O. Deg. & Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. pulchellum Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. subcordatum O. Deg. & Sherff
- Nototrichium Sandwicense (A. Gray) Hillebr. var. syringifolium Sherff
- Nototrichium Viride Hillebr.
- Nototrichium Viride Hillebr. var. kalaupapae H. St. John
- Nototrichium Viride Hillebr. var. oblongifolium Sherff
- Nototrichium Viride Hillebr. var. subtruncatum Sherff
- Nottoway Valley Brome - Bromus Nottowayanus Fernald
- Nova Scotia Dewberry - Rubus Segnis L.H. Bailey
- Nova Scotia Ladiestresses - Spiranthes Casei Catling & Cruise var. novaescotiae Catling
- Novosieversia Glacialis (Adams ex Fisch. & C.A. Mey.) F. Bolle
- Nowellia Curvifolia (Dicks.) Mitt.
- Nowellia Mitt.
- Nowodworkya Imberbis Phil.
- Noyau Vine - Merremia Dissecta (Jacq.) Hallier f.
- Nude Hawthorn - Crataegus Nuda Sarg.
- Nummularia Radicans (Hook.) Kuntze
- Nun's-hood Orchid - Phaius Lour.
- Nun's-hood Orchid - Phaius Tancarvilleae (Banks ex L'Hér.) Blume
- Nuphar Advena (Aiton) W.T. Aiton
- Nuphar Advena (Aiton) W.T. Aiton ssp. ozarkana (G.S. Mill. & Standl.) D. Padge
- Nuphar Advena (Aiton) W.T. Aiton ssp. ulvacea (G.S. Mill. & Standl.) D. Padget
- Nuphar Advena (Aiton) W.T. Aiton var. fraterna (G.S. Mill. & Standl.) Standl.
- Nuphar Advena (Aiton) W.T. Aiton var. tomentosa Torr. & A. Gray
- Nuphar Fluviatilis (Harper) Standl.
- Nuphar Lutea (L.) Sm. ssp. macrophylla (Small) E.O. Beal
- Nuphar Lutea (L.) Sm. ssp. ozarkana (G.S. Mill. & Standl.) E.O. Beal
- Nuphar Microcarpa (G.S. Mill. & Standl.) Standl.
- Nuphar Microphylla (Pers.) Fernald
- Nuphar Orbiculata (Small) Standl.
- Nuphar Ovata (G.S. Mill. & Standl.) Standl.
- Nuphar Ozarkana (G.S. Mill. & Standl.) Standl.
- Nuphar Polysepala Engelm.
- Nuphar Pumila (Timm) DC.
- Nuphar Puteora Fernald
- Nuphar Rubrodisca Morong
- Nuphar Sagittifolia (Walter) Pursh
- Nuphar Variegata Durand
- Nuphar ×interfluitans Fernald
- Nut Palm - Phytelephas Ruiz & Pav.
- Nutgrass - Cyperus Rotundus L.
- Nutmeg Hickory - Carya Myristiciformis (Michx. f.) Nutt.
- Nutmeg - Myristica Fragrans Houtt.
- Nutmeg - Myristica Gronov.
- Nutrush - Scleria Biflora Roxb.
- Nutrush - Scleria Caricina Benth.
- Nutrush - Scleria Ciliaris Nees
- Nutrush - Scleria Laevis Willd.
- Nutrush - Scleria Laxa R. Br.
- Nutrush - Scleria Levis Retz.
- Nutrush - Scleria Novae-hollandiae Boeckeler
- Nutrush - Scleria P.j. Bergius
- Nutrush - Scleria Polycarpa Boeckeler
- Nutrush - Scleria Rugosa R. Br.
- Nutrush - Scleria Scrobiculata Nees & Meyen
- Nutrush - Scleria Sumatrensis Retz.
- Nuttall Oak - Quercus Texana Buckley
- Nuttall's Alkaligrass - Puccinellia Nuttalliana (Schult.) Hitchc.
- Nuttall's Biscuitroot - Lomatium Nuttallii (A. Gray) J.F. Macbr.
- Nuttall's Bladderpod - Lesquerella Gracilis (Hook.) S. Watson ssp. nuttallii (Torr. & A. Gray) Rollins & Sha
- Nuttall's Cornsalad - Valerianella Nuttallii (Torr. & A. Gray) Walp.
- Nuttall's Crinklemat - Tiquilia Nuttallii (Hook.) A.T. Richardson
- Nuttall's Deathcamas - Zigadenus Nuttallii (A. Gray) S. Watson
- Nuttall's Evening Primrose - Oenothera Nuttallii Sweet
- Nuttall's False Foxglove - Agalinis Nuttallii Shinners
- Nuttall's Goosefoot - Chenopodium Berlandieri Moq. ssp. nuttalliae (Saff.) H.D. Wilson & Heiser
- Nuttall's Homalothecium Moss - Homalothecium Nuttallii (Wilson) A. Jaeger
- Nuttall's Horsebrush - Tetradymia Nuttallii Torr. & A. Gray
- Nuttall's Knotweed - Polygonum Douglasii Greene ssp. nuttallii (Small) J.C. Hickman
- Nuttall's Linanthus - Leptosiphon Nuttallii (A. Gray) J.M. Porter & L.A. Johnson
- Nuttall's Linanthus - Leptosiphon Nuttallii (A. Gray) J.M. Porter & L.A. Johnson ssp. nuttallii
- Nuttall's Linanthus - Leptosiphon Nuttallii (A. Gray) J.M. Porter & L.A. Johnson ssp. pubescens (R. Patt.) J
- Nuttall's Little Rose - Chamaerhodos Erecta (L.) Bunge ssp. nuttallii (Pickering ex Rydb.) Hultén
- Nuttall's Lobelia - Lobelia Nuttallii Schult.
- Nuttall's Meadowbeauty - Rhexia Nuttallii C.W. James
- Nuttall's Milkvetch - Astragalus Nuttallii (Torr. & A. Gray) J.T. Howell
- Nuttall's Milkvetch - Astragalus Nuttallii (Torr. & A. Gray) J.T. Howell var. nuttallii
- Nuttall's Milkvetch - Astragalus Nuttallii (Torr. & A. Gray) J.T. Howell var. virgatus (A. Gray ex W.H. Bre
- Nuttall's Milkwort - Polygala Nuttallii Torr. & A. Gray
- Nuttall's Mudflower - Micranthemum Micranthemoides (Nutt.) Wettst.
- Nuttall's Oxytrope - Oxytropis Multiceps Nutt.
- Nuttall's Pleatleaf - Nemastylis Nuttallii Pickering ex R.C. Foster
- Nuttall's Povertyweed - Monolepis Nuttalliana (Schult.) Greene
- Nuttall's Prairie Parsley - Polytaenia Nuttallii DC.
- Nuttall's Quillwort - Isoetes Nuttallii A. Braun ex Engelm.
- Nuttall's Rayless Goldenrod - Bigelowia Nuttallii L.C. Anderson
- Nuttall's Reedgrass - Calamagrostis Coarctata Eaton
- Nuttall's Rockcress - Arabis Nuttallii B.L. Rob.
- Nuttall's Saltbush - Atriplex Nuttallii S. Watson
- Nuttall's Sandwort - Minuartia Nuttallii (Pax) Briq.
- Nuttall's Sandwort - Minuartia Nuttallii (Pax) Briq. ssp. nuttallii
- Nuttall's Saxifrage - Saxifraga Nuttallii Small
- Nuttall's Sensitive-briar - Mimosa Nuttallii (DC. ex Britton & Rose) B.L. Turner
- Nuttall's Sunflower - Helianthus Nuttallii Torr. & A. Gray
- Nuttall's Sunflower - Helianthus Nuttallii Torr. & A. Gray ssp. nuttallii
- Nuttall's Thistle - Cirsium Nuttallii DC.
- Nuttall's Ticktrefoil - Desmodium Nuttallii (Schindl.) B.G. Schub.
- Nuttall's Toothwort - Cardamine Nuttallii Greene
- Nuttall's Toothwort - Cardamine Nuttallii Greene var. covilleana (O.E. Schultz) Rollins
- Nuttall's Toothwort - Cardamine Nuttallii Greene var. dissecta (O.E. Schultz) Rollins
- Nuttall's Toothwort - Cardamine Nuttallii Greene var. gemmata (Greene) Rollins
- Nuttall's Townsend Daisy - Townsendia Nuttallii Dorn
- Nuttall's Violet - Viola Nuttallii Pursh
- Nuttall's Water-starwort - Callitriche Pedunculosa Nutt.
- Nuttall's Wild Indigo - Baptisia Nuttalliana Small
- Nuttall's Yellowcress - Rorippa Curvisiliqua (Hook.) Besser ex Britton var. nuttallii (S. Watson) R. Stuckey
- Nuttallia Argillosa (J. Darl.) W.A. Weber
- Nuttallia Cerasiformis Torr. & A. Gray ex Hook. & Arn.
- Nuttallia Chrysantha (Engelm. ex Brandegee) Greene
- Nuttallia Cronquistii (H.J. Thomp. & Prigge) W.A. Weber
- Nuttallia Decapetala (Pursh ex Sims) Greene
- Nuttallia Densa (Greene) Greene
- Nuttallia Humilis (A. Gray) Rydb.
- Nuttallia Laciniata (Rydb.) Wooton & Standl.
- Nuttallia Laevicaulis (Hook.) Greene
- Nuttallia Marginata Osterh.
- Nuttallia Multicaulis Osterh.
- Nuttallia Multiflora (Nutt.) Greene
- Nuttallia Nuda (Pursh) Greene
- Nuttallia Pterosperma (Eastw.) Greene
- Nuttallia Reverchonii (Urb. & Gilg) W.A. Weber
- Nuttallia Rusbyi (Wooton) Rydb.
- Nuttallia Sinuata (Rydb.) Daniels
- Nuttallia Speciosa (Osterh.) Greene
- Nuttallia Stricta (Osterh.) Greene
- Nutty Saw-wort - Saussurea Nuda Ledeb.
- Nutzotin Milkvetch - Astragalus Nutzotinensis Rouss.
- Nyachia Pulvinata Small
- Nyasaland Mahogany - Khaya Anthotheca (Welw.) C. DC.
- Nyctaginia - Nyctaginia Choisy
- Nyctelea Nyctelea (L.) Britton, nom. inval.
- Nye County False Candytuft - Smelowskia Holmgrenii Rollins
- Nye County Fishhook Cactus - Sclerocactus Nyensis F. Hochstätter
- Nye Gilia - Aliciella Nyensis (Reveal) J.M. Porter
- Nye Milkvetch - Astragalus Nyensis Barneby
- Nyholmiella Gymnostoma (Bruch ex Brid.) Holmen & Warncke
- Nyholmiella Obtusifolia (Brid.) Holmen & Warncke
- Nylander's Lecania Lichen - Lecania Nylanderiana A. Massal.
- Nylander's Lecidea Lichen - Lecidea Nylanderi (Anzi) Th. Fr.
- Nylander's Navel Lichen - Umbilicaria Nylanderiana (Zahlbr.) H. Magn.
- Nylandtia Dum.
- Nylon Hedgehog Cactus - Echinocereus Viridiflorus Engelm.
- Nylon Hedgehog Cactus - Echinocereus Viridiflorus Engelm. var. chloranthus (Engelm.) Backeb.
- Nylon Hedgehog Cactus - Echinocereus Viridiflorus Engelm. var. cylindricus (Engelm.) Rümpler
- Nylon Hedgehog Cactus - Echinocereus Viridiflorus Engelm. var. viridiflorus
- Nymphaea Advena Aiton
- Nymphaea Blanda G. Mey. var. fenzliana (Lehm.) Caspary
- Nymphaea Blanda G. Mey., nom. illeg.
- Nymphaea Bombycina (G.S. Mill. & Standl.) Standl.
- Nymphaea Capensis Thunb. var. zanzibariensis (Caspary) Conard
- Nymphaea Chartacea G.S. Mill. & Standl.
- Nymphaea Fluviatilis Harper
- Nymphaea Fraterna G.S. Mill. & Standl.
- Nymphaea Macrophylla Small
- Nymphaea Minor (Sims) DC.
- Nymphaea Odorata Aiton var. gigantea Tricker
- Nymphaea Odorata Aiton var. godfreyi Ward
- Nymphaea Odorata Aiton var. maxima (Conrad) B. Boivin
- Nymphaea Odorata Aiton var. minor Sims
- Nymphaea Odorata Aiton var. rosea Pursh
- Nymphaea Odorata Aiton var. stenopetala Fernald
- Nymphaea Odorata Aiton var. villosa Caspary
- Nymphaea Orbiculata Small
- Nymphaea Pentapetala Walter, nom. utique rej.
- Nymphaea Polysepala (Engelm.) Greene
- Nymphaea Pulchella DC.
- Nymphaea Reniformis Walter, nom. utique rej.
- Nymphaea Rubrodisca (Morong) Greene
- Nymphaea Sagittifolia Walter
- Nymphaea Tetragona Georgi ssp. leibergii (Morong) A.E. Porsild
- Nymphaea Tetragona Georgi var. leibergii (Morong) B. Boivin
- Nymphaea Tuberosa Paine
- Nymphaea Ulvacea G.S. Mill. & Standl.
- Nymphaea Zanzibariensis Caspary
- Nymphoides Hydrophylla auct. non (Lour.) Kuntze
- Nymphoides Lacunosa (Vent.) Kuntze
- Nymphoides Nymphaeoides (L.) Britton
- Nymphozanthus Advena (Aiton) Fernald
- Nymphozanthus Ozarkanus (G.S. Mill. & Standl.) Palmer & Steyerm.
- Nymphozanthus Polysepalus (Engelm.) Fernald
- Nymphozanthus Rubrodiscus (Morong) Fernald
- Nymphozanthus Sagittifolius (Walter) Fernald
- Nypa Steck
- Nyssa Acuminata Small
- Nyssa Sylvatica Marshall var. biflora (Walter) Sarg.
- Nyssa Sylvatica Marshall var. caroliniana (Poir.) Fernald
- Nyssa Sylvatica Marshall var. dilatata Fernald
- Nyssa Sylvatica Marshall var. typica Fernald
- Nyssa Sylvatica Marshall var. ursina (Small) Wen & Stuessy
- Nyssa Uniflora Wangenh.
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