VegeWorx Plant Index - Letter U
- Uahiapele - Melicope Barbigera A. Gray
- Udeuid - Manilkara Udoido Kaneh.
- Udo - Aralia Cordata Thunb.
- Udora Verticillata (L. f.) Spreng. var. minor Engelm. ex Caspary
- Uhaloa - Waltheria Indica L.
- Uhiuhi - Caesalpinia Kavaiensis H. Mann
- Uinta Basin Beardtongue - Penstemon Grahamii D.D. Keck
- Uinta Basin Cryptantha - Cryptantha Breviflora (Osterh.) Payson
- Uinta Basin Gilia - Aliciella Stenothyrsa (A. Gray) J.M. Porter
- Uinta Basin Hookless Cactus - Sclerocactus Wetlandicus Hochstätter
- Uinta Basin Plainsmustard - Schoenocrambe Argillacea (S.L. Welsh & N.D. Atwood) Rollins
- Uinta Basin Springparsley - Cymopterus Duchesnensis M.E. Jones
- Uinta Basin Stickleaf - Mentzelia Multicaulis (Osterh.) A. Nelson ex J. Darl. var. uintahensis N.H. Holmgren &
- Uinta Basin Waxfruit - Glaucocarpum Suffrutescens (Rollins) Rollins
- Uinta Clover - Trifolium Dasyphyllum Torr. & A. Gray ssp. uintense (Rydb.) J.M. Gillett
- Uinta Fleabane - Erigeron Uintahensis Cronquist
- Uinta Mountain Beardtongue - Penstemon Uintahensis Pennell
- Uinta Mountain Fleabane - Erigeron Goodrichii S.L. Welsh
- Uinta Ragwort - Packera Millelobata (Rydb.) W.A. Weber & Á. Löve
- Uinta Sandwort - Arenaria Kingii (S. Watson) M.E. Jones ssp. uintahensis (A. Nelson) Maguire
- Uinta Wirelettuce - Stephanomeria Minor (Hook.) Nutt. var. uintaensis (Goodrich & S.L. Welsh) Kartesz
- Ukall - Serianthes Kanehirae Fosberg var. kanehirae
- Ulekelakel - Limnophila Fragrans (G. Forst.) Seem. var. brevis Schltr.
- Ulekelakel - Limnophila Indica (L.) Druce var. raymundi Schltr.
- Ulex Gallii Planch.
- Ulex Minor Roth [excluded]
- Ulex Nanus T.F. Forst. ex Symons
- Ulihi Phyllostegia - Phyllostegia Glabra (Gaudich.) Benth.
- Ulihi Phyllostegia - Phyllostegia Glabra (Gaudich.) Benth. var. glabra
- Ulihi Phyllostegia - Phyllostegia Glabra (Gaudich.) Benth. var. lanaiensis Sherff
- Ulluco - Ullucus Tuberosus Loz.
- Ullucus - Ullucus Loz.
- Ulmo - Eucryphia Cav.
- Ulmo - Eucryphia Cordifolia Cav.
- Ulmus Americana L. var. floridana (Chapm.) Little
- Ulmus Campestris auct. non L.
- Ulmus Carpinifolia auct. non Ruppius ex G. Suckow
- Ulmus Chinensis Pers.
- Ulmus Floridana Chapm.
- Ulmus Fulva Michx.
- Ulmus Japonica (Rehder) Sarg.
- Ulmus Minor auct. non Mill.
- Ulmus Racemosa D. Thomas
- Ulmus Wilsoniana C.K. Schneid.
- Ulmus ×notha Wilhelm & G. Ware, nom. inval.
- Ulota Americana (P. Beauv.) Limpr. var. rufescens (E. Britton) Par.
- Ulota Americana (P. Beauv.) Limpr., non Mitt., nom. illeg.
- Ulota Americana Mitt.
- Ulota Barclayi Mitt.
- Ulota Bruchii Hornsch.
- Ulota Cirrata Grout
- Ulota Crispa (Hedw.) Brid. var. alaskana (Cardot & Thér.) Grout
- Ulota Crispa (Hedw.) Brid. var. crispula (Bruch) Hammar
- Ulota Crispa (Hedw.) Brid. var. intermedia (Schimp.) Cardot
- Ulota Crispula Bruch
- Ulota Funstonii Grout
- Ulota Intermedia Schimp.
- Ulota Ludwigii (Brid.) Brid.
- Ulota Maritima Müll. Hal. & Kindb.
- Ulota Moss - Ulota Coarctata (P. Beauv.) Hammar
- Ulota Moss - Ulota Crispa (Hedw.) Brid.
- Ulota Moss - Ulota D. Mohr
- Ulota Moss - Ulota Obtusiuscula Müll. Hal. & Kindb.
- Ulota Moss - Ulota Phyllantha Brid.
- Ulota Moss - Ulota Reptans Mitt.
- Ulota Ulophylla Broth.
- Uloth's Cercidospora Lichen - Cercidospora Ulothii Körb.
- Uluhe - Dicranopteris Emarginata (T. Moore) W.J. Rob.
- Uluhe - Dicranopteris Emarginata (T. Moore) W.J. Rob. var. emarginata
- Uluhe - Dicranopteris Emarginata (T. Moore) W.J. Rob. var. inaequalis O. Deg. & I. Deg.
- Ulunahele - Cyrtandra Kauaiensis Wawra
- Umatilla Biscuitroot - Lomatium Pastorale Darrach & D.H.Wagner
- Umbel Bittercress - Cardamine Oligosperma Nutt. var. kamtschatica (Regel) Detling
- Umbel Clerodendrum - Clerodendrum Umbellatum Poir.
- Umbel Scribble Lichen - Opegrapha Umbellulariae Zahlbr.
- Umber Pussytoes - Antennaria Umbrinella Rydb.
- Umbilicaria Americana Poelt & T. Nash
- Umbilicaria Coriacea Imshaug
- Umbilicaria Papulosa (Ach.) Nyl.
- Umbilicaria Pensylvanica Hoffm.
- Umbilicaria Pustulata (L.) Hoffm.
- Umbilicaria Pustulata (L.) Hoffm. var. papulosa (Ach.) Tuck.
- Umbrella Acacia - Acacia Oswaldii F. Muell.
- Umbrella Bulrush - Scirpus Diffusus Schuyler
- Umbrella Catchbirdtree - Pisonia Umbellifera (J.R. Forst. & G. Forst.) Seem.
- Umbrella Fern - Sticherus C. Presl
- Umbrella Flatsedge - Cyperus Diandrus Torr.
- Umbrella Grass - Enteropogon Acicularis (Lindl.) Lazarides
- Umbrella Indian Mallow - Pseudabutilon Umbellatum (L.) Fryxell
- Umbrella Larkspur - Delphinium Umbraculorum F.H. Lewis & Epling
- Umbrella Milkwort - Tolpis Adans.
- Umbrella Plant - Cyperus Involucratus Rottb.
- Umbrella Star Orchid - Epidendrum Jamaicense Lindl.
- Umbrella Starwort - Stellaria Umbellata Turcz. ex Kar. & Kir.
- Umbrella Thorn - Vachellia Tortilis (Forssk.) Galasso & Banfi
- Umbrella-sedge - Fuirena Rottb.
- Umbrella-tree - Maesopsis Eminii Engl.
- Umbrella-tree - Maesopsis Engl.
- Umbrella-tree - Magnolia Tripetala (L.) L.
- Umbrellagrass - Enteropogon Nees
- Umbrellaleaf - Diphylleia Michx.
- Umbrellawort - Tauschia Schltdl.
- Umpqua Mariposa Lily - Calochortus Umpquaensis N.A. Fredricks
- Umtanum Desertparsley - Lomatium Quintuplex Schlessman & Constance
- Una De Gato - Martynia Annua L.
- Unamia Alba (Nutt.) Rydb.
- Unamia Lutescens (Lindl. ex DC.) Rydb.
- Unarmed Buckwheat - Eriogonum Inerme (S. Watson) Jeps.
- Unarmed Buckwheat - Eriogonum Inerme (S. Watson) Jeps. var. hispidulum Goodman
- Unarmed Buckwheat - Eriogonum Inerme (S. Watson) Jeps. var. inerme
- Unarmed Elmleaf Blackberry - Rubus Ulmifolius Schott var. anoplothyrsus Sudre
- Uncaria Korrensis Kaneh.
- Uncaria - Uncaria Schreb.
- Uncinia Uncinata (L. f.) Kük. var. uliginosa Skottsb.
- Uncompahgre Bladderpod - Lesquerella Vicina J.L. Anderson, Reveal & Rollins
- Undergreen Willow - Salix Commutata Bebb
- Underwood's Spikemoss - Selaginella Underwoodii Hieron.
- Underwood's Stopper - Eugenia Underwoodii Britton
- Undulate Atrichum Moss - Atrichum Undulatum (Hedw.) P. Beauv.
- Undulate Dicranum Moss - Dicranum Undulatum Brid.
- Undulate Jelly Lichen - Collema Undulatum Laurer ex Flotow
- Undulate Jelly Lichen - Collema Undulatum Laurer ex Flotow var. granulosum Degel.
- Undulate Neckeropsis Moss - Neckeropsis Undulata (Hedw.) Reichardt
- Undulate Plagiothecium Moss - Plagiothecium Undulatum (Hedw.) Schimp.
- Undulate Speedwell - Veronica Undulata Wall.
- Unequal Leaf Bryoerythrophyllum Moss - Bryoerythrophyllum Inaequalifolium (Taylor) R.H. Zander
- Unexpected Larkspur - Delphinium Inopinum (Jeps.) F.H. Lewis & Epling
- Ungnadia - Ungnadia Endl.
- Unicorn-plant - Proboscidea Schmidel
- Unifolium Canadense (Desf.) Greene
- Uniola Flatsedge - Cyperus Unioloides R. Br.
- Uniola Latifolia Michx.
- Uniola Laxa (L.) Britton, Sterns & Poggenb.
- Uniola Longifolia Scribn.
- Uniola Nitida Baldw.
- Uniola Ornithorhyncha Steud.
- Uniola Sessiliflora Poir.
- Uniola Spicata L.
- Uniola Virgata (Poir.) Griseb.
- United Blazingstar - Mentzelia Congesta Nutt. ex Torr. & A. Gray
- Unshu Orange - Citrus Reticulata Blanco ssp. unshiu (Marcow.) D.Rivera Núñez et al.
- Upland Beardtongue - Penstemon Saxosorum Pennell
- Upland Bentgrass - Agrostis Perennans (Walter) Tuck.
- Upland Blackberry - Rubus Pergratus Blanch.
- Upland Boneset - Eupatorium Sessilifolium L.
- Upland Boneset - Eupatorium Sessilifolium L. var. brittonianum Porter
- Upland Boneset - Eupatorium Sessilifolium L. var. sessilifolium
- Upland Boneset - Eupatorium Sessilifolium L. var. vaseyi (Porter) Fernald & Grisc.
- Upland Brittle Bladderfern - Cystopteris Tenuis (Michx.) Desv.
- Upland Cotton - Gossypium Hirsutum L.
- Upland Cotton - Gossypium Hirsutum L. var. hirsutum
- Upland Cyrtandra - Cyrtandra Macraei A. Gray
- Upland Dewberry - Rubus Invisus (L.H. Bailey) Britton
- Upland Highbush Blueberry - Vaccinium Simulatum Small
- Upland Larkspur - Delphinium Nuttallii A. Gray
- Upland Larkspur - Delphinium Nuttallii A. Gray ssp. nuttallii
- Upland Larkspur - Delphinium Nuttallii A. Gray ssp. ochroleucum (Nutt.) Warnock
- Upland Swampprivet - Forestiera Ligustrina (Michx.) Poir.
- Upland Yellow Violet - Viola Praemorsa Douglas ex Lindl. ssp. flavovirens (Pollard) Fabijan
- Upland Yellow Violet - Viola Praemorsa Douglas ex Lindl. ssp. linguifolia (Nutt.) M.S. Baker & J.C. Cla
- Upright Blue Beardtongue - Penstemon Virgatus A. Gray
- Upright Burhead - Echinodorus Berteroi (Spreng.) Fassett
- Upright Carrionflower - Smilax Ecirrhata (Engelm. ex Kunth) S. Watson
- Upright Chickweed - Moenchia Ehrh.
- Upright Chickweed - Moenchia Erecta (L.) G. Gaertn., B. Mey. & Scherb.
- Upright Myrtle Spurge - Euphorbia Rigida M. Bieb.
- Upright Pellitory - Parietaria Officinalis L.
- Upright Pepperweed - Lepidium Strictum (S. Watson) Rattan
- Upright Prairie Coneflower - Ratibida Columnifera (Nutt.) Wooton & Standl.
- Upright Sedge - Carex Stricta Lam.
- Upright Spurge - Euphorbia Stricta L.
- Upsala Crabseye Lichen - Ochrolechia Upsaliensis (L.) A. Massal.
- Urachne Fusca Steud.
- Urachne Setosa Trin., nom. illeg.
- Urachne Stipoides Trin. & Rupr.
- Uralanguis - Anacolosa Glochidiiformis Kaneh. & Hatus.
- Uralanguis - Tylophora Polyantha Volkens
- Uralepis Pilosa Buckley
- Uraria - Uraria Desv.
- Urban Spurge - Euphorbia Agraria M. Bieb.
- Urban's Beggartick - Bidens Reptans (L.) G. Don var. urbanii (Greenm.) O.E. Schulz
- Urban's False Cocaine - Erythroxylum Urbanii O.E. Schulz
- Urban's Flatsedge - Cyperus Urbanii Boeckeler
- Urban's Holly - Ilex Urbaniana Loes.
- Urban's Holly - Ilex Urbaniana Loes. var. urbaniana
- Urban's Lineleaf Fern - Antrophyum Urbanii Brause
- Urban's Lovegrass - Eragrostis Urbaniana Hitchc.
- Urban's Mimosa - Mimosa Quadrivalvis L. var. urbaniana Barneby
- Urban's Nakedwood - Colubrina Verrucosa (Urb.) M.C. Johnst.
- Urban's Sandmat - Chamaesyce Urbanii Millsp.
- Urceolaria Actinostoma Ach.
- Urceolaria Albissima (Ach.) Fink
- Urceolaria Exotica J.F. Gmel.
- Urceolaria Scruposa (Schreb.) Ach.
- Urceolate Conotrema Lichen - Conotrema Urceolatum (Ach.) Tuck.
- Urceolate Dactylospora Lichen - Dactylospora Urceolata (Th. Fr.) Arnold
- Urceolate Nitrogen Moss - Tetraplodon Urceolatus (Hedw.) Bruch & Schimp.
- Urechites Lutea (L.) Britton var. sericea R.W. Long, orth. var.
- Urechites Lutea (L.) Britton, orth. var.
- Urechites Luteus (L.) Britton
- Urechites Luteus (L.) Britton var. sericeus R.W. Long
- Urechites Pinetorum Small
- Urena Lobata L. ssp. sinuata (L.) Waalkes
- Urena Lobata L. var. sinuata (L.) Miq. ex Kuntze
- Urena Trilobata Vell.
- Urena - Urena L.
- Urera Konaensis H. St. John
- Urera Sandvicensis Weddell
- Urera Sandvicensis Weddell var. kauaiensis Rock
- Urera Sandvicensis Weddell var. mollis Weddell
- Urera - Urera Gaudich.
- Urera - Urera Obovata Benth.
- Urginea Scilla Steinh.
- Urn Gum - Eucalyptus Urnigera Hook. f.
- Urn Lichen - Tholurna Dissimilis (Norman) Norman
- Urn Lichen - Tholurna Norman
- Urn Orchid - Bletilla Striata (Thunb.) Rchb. f.
- Urnflower Alumroot - Heuchera Elegans Abrams
- Urnplant - Aechmea Fasciata (Lindl.) Baker
- Urochloa Bulbodes (Steud.) Stapf [excluded]
- Urochloa Dictyoneura (Fig. & De Not.) Veldkamp
- Urochloa Fasciculata (Sw.) R. Webster var. reticulata (Torr.) R. Webster
- Urochloa Fasciculata (Sw.) R. Webster, nom. illeg.
- Urochloa Paspaloides J. Presl
- Urochloa Platytaenia (Stapf) Crins
- Urochloa Pullalans Stapf [excluded]
- Urochloa Ruziziensis (Germ. & Evrard) Crins
- Urochloa Stolonifera (Gooss.) L. Chippindale [excluded]
- Urochloa Subquadripara (Trin.) R. Webster
- Urochloa Uniseta J. Presl
- Urochloa ×antholeuca (Schinz) H. Scholz
- Uropappus Lindleyi (DC.) Nutt.
- Uropappus Linearifolius Nutt.
- Urospermum - Urospermum Scop.
- Urostachys Aqualupianus (Spring) Herter
- Urostachys Chinensis (Christ) Herter ex Nessel
- Urostachys Dichotomus (Jacq.) Herter
- Urostachys Erubescens (Brack.) Herter ex Nessel
- Urostachys Funiformis (Cham. ex Spring) Herter
- Urostachys Haleakalae (Brack.) Herter
- Urostachys Linifolius (L.) Herter
- Urostachys Lucidulus (Michx.) Herter ex Nessel
- Urostachys Lucidulus (Michx.) Herter ex Nessel var. porophilus (Lloyd & Underw.) Hert
- Urostachys Miyoshiana (Makino) Herter ex Nessel
- Urostachys Nutans (Brack.) Herter ex Nessel
- Urostachys Phyllanthus (Hook. & Arn.) Herter
- Urostachys Polytrichoides (Kaulf.) Herter ex Nessel
- Urostachys Porophilus (Lloyd & Underw.) Herter ex Nessel
- Urostachys Portoricensis (Underw. & Lloyd) Herter
- Urostachys Reflexus (Lam.) Herter
- Urostachys Selago (L.) Herter ex Nessel
- Urostachys Serratus (Thunb.) Herter
- Urostachys Sintenisii Herter
- Urostachys Sulcinervius (Spring) Herter ex Nessel
- Urostachys Taxifolius (Sw.) Herter
- Urostachys Tenuicaulis (Underw. & Lloyd) Herter
- Urostachys Verticillatus auct. non (L. f.) Herter
- Urostachys Wilsonii (Underw. & Lloyd) Herter
- Urostachys ×helleri (Herter) Herter ex Nessel
- Urtica Aestuans L.
- Urtica Baccifera L.
- Urtica Breweri S. Watson
- Urtica Californica Greene
- Urtica Canadensis L.
- Urtica Caracasana Jacq.
- Urtica Cardiophylla Rydb.
- Urtica Chamaedryoides Pursh var. runyonii Correll
- Urtica Cylindrica L.
- Urtica Dioica L. var. angustifolia Schltdl.
- Urtica Dioica L. var. californica (Greene) C.L. Hitchc.
- Urtica Dioica L. var. gracilis (Aiton) C.L. Hitchc.
- Urtica Dioica L. var. holosericea (Nutt.) C.L. Hitchc.
- Urtica Dioica L. var. lyallii (S. Watson) C.L. Hitchc.
- Urtica Dioica L. var. occidentalis S. Watson
- Urtica Dioica L. var. procera (Muhl. ex Willd.) Weddell
- Urtica Gracilis Aiton
- Urtica Gracilis Aiton ssp. holosericea (Nutt.) W.A. Weber
- Urtica Gracilis Aiton var. greenei (Jeps.) Jeps.
- Urtica Gracilis Aiton var. holosericea (Nutt.) Jeps.
- Urtica Gracilis Aiton var. latifolia Farw.
- Urtica Grandis Hook. & Arn.
- Urtica Herniarioides Sw.
- Urtica Holosericea Nutt.
- Urtica Interrupta L.
- Urtica Lyallii S. Watson
- Urtica Lyallii S. Watson var. californica (Greene) Jeps.
- Urtica Major H.P. Fuchs
- Urtica Nivea L.
- Urtica Nummulariifolia Sw.
- Urtica Parietaria L.
- Urtica Procera Muhl. ex Willd.
- Urtica Pumila L.
- Urtica Serra auct. non Blume
- Urtica Strigosissima Rydb.
- Urtica Trachycarpa Weddell
- Urtica Trianthemoides Sw.
- Urtica Viridis Rydb.
- Urticastrum Divaricatum (L.) Kuntze
- Uruguayan Fountaingrass - Pennisetum Latifolium Spreng.
- Uruguayan Needlegrass - Nassella Neesiana (Trin. & Rupr.) Barkworth
- Uruguayan Pampas Grass - Cortaderia Selloana (Schult. & Schult. f.) Asch. & Graebn.
- Uruguayan Vervain - Verbena Montevidensis Spreng.
- Urvillea - Urvillea Kunth
- Usnea Amblyoclada (Müll. Arg.) Zahlbr.
- Usnea Ammannii P. Clerc & Herrera-Campos
- Usnea Antillarum (Vain.) Zahlbr.
- Usnea Barbata (L.) F.H. Wigg. var. xanthopoga (Nyl.) Müll. Arg.
- Usnea Betulina Mot.
- Usnea Caucasica Vain.
- Usnea Chaetophora Stirt.
- Usnea Comosa auct.
- Usnea Compacta (Rasanen) Mot.
- Usnea Dasaea Stirt.
- Usnea Dasypoga auct.
- Usnea Distincta Mot.
- Usnea Esperantiana Clerc
- Usnea Esthonica Rasanen
- Usnea Flagellata Mot.
- Usnea Halei P. Clerc
- Usnea Implicata (Stirt.) Zahlbr.
- Usnea Inflata Delise ex Duby
- Usnea Kujalae Rasanen
- Usnea Laracina Vain. ex Rasanen
- Usnea Lichenoconium Lichen - Lichenoconium Usneae (Anzi) D. Hawksw.
- Usnea Madierensis Mot.
- Usnea Mollis Stirt.
- Usnea Nashii P. Clerc & Herrera-Campos
- Usnea Nidulans Mot.
- Usnea Pacificana Halonen
- Usnea Perplectata Mot.
- Usnea Phaeosporobolus - Phaeosporobolus Usneae D. Hawksw. & Hafellner
- Usnea Rubiginea (Michx.) A. Massal.
- Usnea Rugulosa Vain.
- Usnea Scabrata Nyl. ssp. nylanderiana Mot.
- Usnea Silvatica Mot.
- Usnea Similis Mot. ex Rasanen
- Usnea Sorediifera (Arnold) Lynge
- Usnea Sorediifera sensu Mot.
- Usnea Spinulifera (Vain.) Mot.
- Usnea Subcariosa Mot.
- Usnea Subcavata Mot.
- Usnea Sublaxa Vain.
- Usnea Variolosa Mot.
- Usnea Wasmuthii Rasanen
- Utah Agave - Agave Utahensis Engelm.
- Utah Agave - Agave Utahensis Engelm. var. eborispina (Hester) Breitung
- Utah Agave - Agave Utahensis Engelm. var. utahensis
- Utah Alumroot - Heuchera Parvifolia Nutt. ex Torr. & A. Gray var. utahensis (Rydb.) Garrett
- Utah Angelica - Angelica Wheeleri S. Watson
- Utah Bird's-foot Trefoil - Lotus Utahensis Ottley
- Utah Bladderfern - Cystopteris Utahensis Windham & Haufler
- Utah Bladderpod - Lesquerella Utahensis Rydb.
- Utah Buttercup - Ranunculus Jovis A. Nelson
- Utah Butterflybush - Buddleja Utahensis Coville
- Utah Columbine - Aquilegia Scopulorum Tidestr.
- Utah Columbine - Aquilegia Scopulorum Tidestr. var. calcarea (M.E. Jones) Munz
- Utah Columbine - Aquilegia Scopulorum Tidestr. var. scopulorum
- Utah Cracked Lichen - Acarospora Utahensis H. Magn.
- Utah Croton - Croton Texensis (Klotzsch) Müll. Arg. var. utahensis Cronquist
- Utah Desertparsley - Lomatium Parryi (S. Watson) J.F. Macbr.
- Utah Fendlerbush - Fendlerella Utahensis (S. Watson) A. Heller
- Utah Fendlerbush - Fendlerella Utahensis (S. Watson) A. Heller var. cymosa (Greene ex Wooton & Standl.) K
- Utah Fendlerbush - Fendlerella Utahensis (S. Watson) A. Heller var. utahensis
- Utah Fleabane - Erigeron Utahensis A. Gray
- Utah Fleabane - Erigeron Utahensis A. Gray var. sparsifolius (Eastw.) Cronquist
- Utah Fleabane - Erigeron Utahensis A. Gray var. utahensis
- Utah Honeysuckle - Lonicera Utahensis S. Watson
- Utah Juniper - Juniperus Osteosperma (Torr.) Little
- Utah Lupine - Lupinus Caespitosus Nutt. var. utahensis (S. Watson) Cox
- Utah Milkvetch - Astragalus Utahensis (Torr.) Torr. & A. Gray
- Utah Milkweed - Asclepias Labriformis M.E. Jones
- Utah Mortonia - Mortonia Utahensis (Coville ex A. Gray) A. Nelson
- Utah Mousetail - Ivesia Utahensis S. Watson
- Utah Muhly - Muhlenbergia Curtifolia Scribn.
- Utah Pea - Lathyrus Pauciflorus Fernald var. utahensis (M.E. Jones) Piper ex M. Peck
- Utah Penstemon - Penstemon Utahensis Eastw.
- Utah Phacelia - Phacelia Utahensis J. Voss
- Utah Rim Lichen - Lecanora Utahensis H. Magn.
- Utah Serviceberry - Amelanchier Utahensis Koehne
- Utah Serviceberry - Amelanchier Utahensis Koehne var. utahensis
- Utah Small Camas - Camassia Quamash (Pursh) Greene ssp. utahensis Gould
- Utah Snowberry - Symphoricarpos Oreophilus A. Gray var. utahensis (Rydb.) A. Nelson
- Utah Spikemoss - Selaginella Utahensis Flowers
- Utah Suncup - Camissonia Scapoidea (Nutt. ex Torr. & A. Gray) P.H. Raven ssp. utahensis (P.H. Raven
- Utah Swallow-wort - Cynanchum Utahense (Engelm.) Woodson
- Utah Swampfire - Sarcocornia Utahensis (Tidestr.) A.J. Scott
- Utah Sweetvetch - Hedysarum Boreale Nutt.
- Utah Sweetvetch - Hedysarum Boreale Nutt. ssp. boreale
- Utah Sweetvetch - Hedysarum Boreale Nutt. ssp. boreale var. boreale
- Utah Sweetvetch - Hedysarum Boreale Nutt. ssp. boreale var. gremiale (Rollins) Northstrom & S.L. Wel
- Utah Violet - Viola Utahensis M.S. Baker & J.C. Clausen ex Baker
- Ute Lady's Tresses - Spiranthes Diluvialis Sheviak
- Utricularia Biflora Lam.
- Utricularia Cleistogama (A. Gray) Britton
- Utricularia Fibrosa Walter
- Utricularia Fibrosa sensu Britton, non Walter
- Utricularia Fimbriata auct. non Kunth
- Utricularia Guyanensis A. DC. [excluded]
- Utricularia Inflata Walter var. minor Chapm.
- Utricularia Mixta Barnhart
- Utricularia Obtusa Sw.
- Utricularia Occidentalis A. Gray
- Utricularia Peckii S.F. Blake
- Utricularia Pumila Walter
- Utricularia Virgatula Barnhart
- Utricularia Vulgaris L. p.p.
- Utricularia Vulgaris L. ssp. macrorhiza (Leconte) R.T. Clausen
- Utricularia Vulgaris L. var. americana A. Gray
- Uva-ursi Uva-ursi (L.) Britton, nom. inval.
- Uvaria Odorata Lam.
- Uvera - Coccoloba Pyrifolia Desf.
- Uvero De Monte - Coccoloba Sintenisii Urb. ex Lindau
- Uvilla - Coccoloba Costata C. Wright ex Sauvalle
- Uvularia Amplexifolia L.
- Uvularia Carolina (J.F. Gmel.) Wilbur
- Uvularia Nitida (Britton) Mack.
- Uvularia Puberula Michx. var. nitida (Britton) Fernald
- Uvularia Pudica sensu Fernald
- Uvularia Pudica sensu Fernald var. nitida (Britton) Fernald
- Uvularia Smithii Hook.
- Uñi - Ugni Turcz.
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