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alfalfa	MESA	Medicago sativa L.
alkali sacaton	SPAI	Sporobolus airoides (Torr.) Torr.
alsike clover	TRHY	Trifolium hybridum L.
amberique-bean	STHE9	Strophostyles helvola (L.) Elliott
American basswood	TIAM	Tilia americana L.
American basswood	TIAMA	Tilia americana L. var. americana
American basswood	TIAMH	Tilia americana L. var. heterophylla (Vent.) Loud.
American beachgrass	AMBR	Ammophila breviligulata Fern.
American beautyberry	CAAM2	Callicarpa americana L.
American bittersweet	CESC	Celastrus scandens L.
American bur-reed	SPAM	Sparganium americanum Nutt.
American ginseng	PAQU	Panax quinquefolius L.
American hazelnut	COAM3	Corylus americana Walt.
American hogpeanut	AMBR2	Amphicarpaea bracteata (L.) Fern.
American holly	ILOP	Ilex opaca Ait.
American hornbeam	CACA18	Carpinus caroliniana Walt.
American plum	PRAM	Prunus americana Marsh.
American red raspberry	RUID	Rubus idaeus L.
American sloughgrass	BESY	Beckmannia syzigachne (Steud.) Fern.
American sycamore	PLOC	Platanus occidentalis L.
American water plantain	ALSU	Alisma subcordatum Raf.
American wild carrot	DAPU3	Daucus pusillus Michx.
Amur maple	ACGI	Acer ginnala Maxim.
annual hairgrass	DEDA	Deschampsia danthonioides (Trin.) Munro
antelope bitterbrush	PUTR2	Purshia tridentata (Pursh) DC.
apple	MALUS	Malus P. Mill.
arborvitae	THOC2	Thuja occidentalis L.
Arizona cottontop	DICA8	Digitaria californica (Benth.) Henr.
Arizona cypress	CUAR	Cupressus arizonica Greene
Arnold hawthorn	CRAN6	Crataegus ×anomala Sarg. (pro sp.) [intricata × mollis]
Aronia melanocarpa (Michx.) Ell.	PHME13	Aronia melanocarpa (Michx.) Ell.
arrowfeather threeawn	ARPU8	Aristida purpurascens Poir.
arumleaf arrowhead	SACU	Sagittaria cuneata Sheldon
Atlantic ninebark	PHOPI	Physocarpus opulifolius (L.) Maxim. var. intermedius (Rydb.) B.L. Robins.
Atlantic white cedar	CHTH2	Chamaecyparis thyoides (L.) B.S.P.
Aztec tobacco	NIRU	Nicotiana rustica L.
bald cypress	TADI2	Taxodium distichum (L.) L.C. Rich.
balsam fir	ABBA	Abies balsamea (L.) P. Mill.
Baltic rush	JUARL	Juncus arcticus Willd. ssp. littoralis (Engelm.) Hultén
barberry hawthorn	CRBE2	Crataegus berberifolia Torr. & Gray
basin big sagebrush	ARTRT	Artemisia tridentata Nutt. ssp. tridentata
basin wildrye	LECI4	Leymus cinereus (Scribn. & Merr.) A. Löve
basket rush	JUTE2	Juncus textilis Buch.
beach plum	PRMA2	Prunus maritima Marsh.
beach strawberry	FRCH	Fragaria chiloensis (L.) P. Mill.
beach strawberry	FRCHC	Fragaria chiloensis (L.) P. Mill. ssp. chiloensis (L.) P. Mill. [excluded]
beach strawberry	FRCHL	Fragaria chiloensis (L.) P. Mill. ssp. lucida (Vilm.) Staudt
beaked hazelnut	COCO6	Corylus cornuta Marsh.
beaked panicgrass	PAAN	Panicum anceps Michx.
bearded beggarticks	BIAR	Bidens aristosa (Michx.) Britt.
beardless wheatgrass	PSSPI	Pseudoroegneria spicata (Pursh) A. Löve ssp. inermis (Scribn. & J.G. Sm.) A. Löve
beardless wildrye	LETR5	Leymus triticoides (Buckl.) Pilger
beardtongue	PENST	Penstemon Schmidel
Bebb willow	SABE2	Salix bebbiana Sarg.
Bermudagrass	CYDA	Cynodon dactylon (L.) Pers.
big bluestem	ANGE	Andropogon gerardii Vitman
big cordgrass	SPCY	Spartina cynosuroides (L.) Roth
big sacaton	SPWR2	Sporobolus wrightii Munro ex Scribn.
big sagebrush	ARTR2	Artemisia tridentata Nutt.
big sagebrush	ARTRP2	Artemisia tridentata Nutt. ssp. parishii (Gray) Hall & Clements
big sagebrush	ARTRS2	Artemisia tridentata Nutt. ssp. spiciformis (Osterhout) Kartesz & Gandhi
big sagebrush	ARTRX	Artemisia tridentata Nutt. ssp. xericensis Winward ex R. Rosentreter & R. Kelsey
big saltbush	ATLE	Atriplex lentiformis (Torr.) S. Wats.
big squirreltail	ELMU3	Elymus multisetus M.E. Jones
bigleaf maple	ACMA3	Acer macrophyllum Pursh
billion-dollar grass	ECFR	Echinochloa frumentacea Link
bird's-foot trefoil	LOCO6	Lotus corniculatus L.
bitter cherry	PREM	Prunus emarginata (Dougl. ex Hook.) D. Dietr.
bitter panicgrass	PAAM2	Panicum amarum Ell.
bitter panicgrass	PAAMA2	Panicum amarum Ell. var. amarulum (A.S. Hitchc. & Chase) P.G. Palmer
bitter root	LERE7	Lewisia rediviva Pursh
black ash	FRNI	Fraxinus nigra Marsh.
black cherry	PRSE2	Prunus serotina Ehrh.
black cherry	PRSEE	Prunus serotina Ehrh. var. eximia (Small) Little
black cherry	PRSER2	Prunus serotina Ehrh. var. rufula (Woot. & Standl.) McVaugh
black cherry	PRSES	Prunus serotina Ehrh. var. serotina
black cherry	PRSEV	Prunus serotina Ehrh. var. virens (Woot. & Standl.) McVaugh
black chokeberry	PHME13	Photinia melanocarpa (Michx.) Robertson & Phipps
black cottonwood	POBAT	Populus balsamifera L. ssp. trichocarpa (Torr. & Gray ex Hook.) Brayshaw
black grama	BOER4	Bouteloua eriopoda (Torr.) Torr.
black hawthorn	CRDO2	Crataegus douglasii Lindl.
black locust	ROPS	Robinia pseudoacacia L.
black spruce	PIMA	Picea mariana (P. Mill.) B.S.P.
black walnut	JUNI	Juglans nigra L.
blackeyed Susan	RUHI2	Rudbeckia hirta L.
blackgum	NYSY	Nyssa sylvatica Marsh.
blacksamson echinacea	ECAN2	Echinacea angustifolia DC.
bladderpod spiderflower	CLIS	Cleome isomeris Greene
blowout grass	REFL	Redfieldia flexuosa (Thurb.) Vasey
blue elder	SANIC6	Sambucus nigra L. ssp. caerulea (Raf.) R. Bolli
blue flax	LIPE2	Linum perenne L.
blue grama	BOGR2	Bouteloua gracilis (Willd. ex Kunth) Lag. ex Griffiths
blue mistflower	COCO13	Conoclinium coelestinum (L.) DC.
blue oak	QUDO	Quercus douglasii Hook. & Arn.
blue spruce	PIPU	Picea pungens Engelm.
blue wild indigo	BAAU	Baptisia australis (L.) R. Br. ex Ait. f.
blue wildrye	ELGL	Elymus glaucus Buckl.
bluebunch wheatgrass	PSSP6	Pseudoroegneria spicata (Pursh) A. Löve
bluebunch wheatgrass	PSSPS	Pseudoroegneria spicata (Pursh) A. Löve ssp. spicata
bluedicks	DICA14	Dichelostemma capitatum (Benth.) Wood
bluedicks	DICAC5	Dichelostemma capitatum (Benth.) Wood ssp. capitatum
bluedicks	DICAP	Dichelostemma capitatum (Benth.) Wood ssp. pauciflorum (Torr.) G. Keator
bluejoint	CACA4	Calamagrostis canadensis (Michx.) Beauv.
bluestem pricklypoppy	ARALT	Argemone albiflora Hornem. ssp. texana G.B. Ownbey
bowltube iris	IRMA	Iris macrosiphon Torr.
boxelder	ACNE2	Acer negundo L.
Brainerd's hawthorn	CRBR3	Crataegus brainerdii Sarg.
branched bur-reed	SPAN	Sparganium androcladum (Engelm.) Morong
bristly locust	ROHIF8	Robinia hispida L. var. fertilis (Ashe) Clausen
broadbeard beardtongue	PEAN4	Penstemon angustifolius Nutt. ex Pursh
broadfruit bur-reed	SPEU	Sparganium eurycarpum Engelm. ex Gray
broadleaf arrowhead	SALA2	Sagittaria latifolia Willd.
broom snakeweed	GUSA2	Gutierrezia sarothrae (Pursh) Britt. & Rusby
broomsedge bluestem	ANVI2	Andropogon virginicus L.
brownseed paspalum	PAPL3	Paspalum plicatulum Michx.
Buchloe dactyloides (Nutt.) Engelm.	BODA2	Buchloe dactyloides (Nutt.) Engelm.
buckhorn cholla	CYACA2	Cylindropuntia acanthocarpa (Engelm. & Bigelow) F.M. Knuth var. acanthocarpa
buffalograss	BODA2	Bouteloua dactyloides (Nutt.) J.T. Columbus
bulbous canarygrass	PHAQ	Phalaris aquatica L.
bur oak	QUMA2	Quercus macrocarpa Michx.
burclover	MEPO3	Medicago polymorpha L.
burrograss	SCBR2	Scleropogon brevifolius Phil.
bursting-heart	EUAM9	Euonymus americanus L.
bushy blazingstar	MEDI	Mentzelia dispersa S. Wats.
bushy bluestem	ANGL2	Andropogon glomeratus (Walt.) B.S.P.
butterfly mariposa lily	CAVE3	Calochortus venustus Dougl. ex Benth.
butterfly milkweed	ASTU	Asclepias tuberosa L.
butternut	JUCI	Juglans cinerea L.
button eryngo	ERYU	Eryngium yuccifolium Michx.
cabbage palmetto	SAPA	Sabal palmetto (Walt.) Lodd. ex J.A. & J.H. Schultes
calamus	ACCA4	Acorus calamus L.
California black oak	QUKE	Quercus kelloggii Newberry
California brome	BRCA5	Bromus carinatus Hook. & Arn.
California buckeye	AECA	Aesculus californica (Spach) Nutt.
California bulrush	SCCA11	Schoenoplectus californicus (C.A. Mey.) Palla
California fescue	FECA	Festuca californica Vasey
California flannelbush	FRCA6	Fremontodendron californicum (Torr.) Coville
California foothill pine	PISA2	Pinus sabiniana Dougl. ex Dougl.
California live oak	QUAG	Quercus agrifolia Née
California redbud	CEOR9	Cercis orbiculata Greene
California wax myrtle	MOCA6	Morella californica (Cham.) Wilbur
California yerba santa	ERCA6	Eriodictyon californicum (Hook. & Arn.) Torr.
Canada wildrye	ELCA4	Elymus canadensis L.
Canadian milkvetch	ASCA11	Astragalus canadensis L.
Canadian wildginger	ASCA	Asarum canadense L.
cane bluestem	BOBA3	Bothriochloa barbinodis (Lag.) Herter
canyon live oak	QUCH2	Quercus chrysolepis Liebm.
cardinalflower	LOCA2	Lobelia cardinalis L.
Carnegia gigantea (Engelm.) Britt. & Rose [orthographic variant]	CAGI10	Carnegia gigantea (Engelm.) Britt. & Rose [orthographic variant]
Carolina basswood	TIAMC	Tilia americana L. var. caroliniana (P. Mill.) Castigl.
cassava	MAES	Manihot esculenta Crantz
Caucasian bluestem	BOBL	Bothriochloa bladhii (Retz.) S.T. Blake
cereal rye	SECE	Secale cereale L.
cerro hawthorn	CRER	Crataegus erythropoda Ashe
chairmaker's bulrush	SCAM6	Schoenoplectus americanus (Pers.) Volk. ex Schinz & R. Keller
chalky bluestem	ANCA4	Andropogon capillipes Nash
chaparral yucca	HEWH	Hesperoyucca whipplei (Torr.) Baker
cheatgrass	BRTE	Bromus tectorum L.
checker lily	FRAF2	Fritillaria affinis (Schultes) Sealy
cherrybark oak	QUPA5	Quercus pagoda Raf.
chia	SACO6	Salvia columbariae Benth.
Chinese privet	LISI	Ligustrum sinense Lour.
Chinese tallow	TRSE6	Triadica sebifera (L.) Small
chinkapin	CAPU9	Castanea pumila (L.) P. Mill.
Chloris crinita Lag.	TRCR9	Chloris crinita Lag.
Chloris pluriflora (Fourn.) W.D. Clayton	TRPL3	Chloris pluriflora (Fourn.) W.D. Clayton
chokecherry	PRVI	Prunus virginiana L.
clasping coneflower	DRAM	Dracopis amplexicaulis (Vahl) Cass.
clustered bur-reed	SPGL	Sparganium glomeratum (Beurling ex Laestad.) L. Neum.
clustered tarweed	HEFA	Hemizonia fasciculata (DC.) Torr. & Gray
coast tarweed	MASA	Madia sativa Molina
coastal indigo	INMI	Indigofera miniata Ortega
coastal sandbur	CESP4	Cenchrus spinifex Cav.
coastal sweetpepperbush	CLAL3	Clethra alnifolia L.
cockspur hawthorn	CRCR2	Crataegus crus-galli L.
coco yam	COES	Colocasia esculenta (L.) Schott
common buttonbush	CEOC2	Cephalanthus occidentalis L.
common carpetgrass	AXFI	Axonopus fissifolius (Raddi) Kuhlm.
common elderberry	SANIC4	Sambucus nigra L. ssp. canadensis (L.) R. Bolli
common evening-primrose	OEBI	Oenothera biennis L.
common hackberry	CEOC	Celtis occidentalis L.
common lilac	SYVU	Syringa vulgaris L.
common madia	MAEL	Madia elegans D. Don ex Lindl.
common milkweed	ASSY	Asclepias syriaca L.
common ninebark	PHOP	Physocarpus opulifolius (L.) Maxim.
common ninebark	PHOPO	Physocarpus opulifolius (L.) Maxim. var. opulifolius
common persimmon	DIVI5	Diospyros virginiana L.
common reed	PHAU7	Phragmites australis (Cav.) Trin. ex Steud.
common rush	JUEF	Juncus effusus L.
common serviceberry	AMAR3	Amelanchier arborea (Michx. f.) Fern.
common snowberry	SYAL	Symphoricarpos albus (L.) Blake
common spikerush	ELPA3	Eleocharis palustris (L.) Roemer & J.A. Schultes
common sunflower	HEAN3	Helianthus annuus L.
common threesquare	SCPU10	Schoenoplectus pungens (Vahl) Palla
common winterberry	ILVE	Ilex verticillata (L.) Gray
common yarrow	ACMI2	Achillea millefolium L.
composite dropseed	SPCOC2	Sporobolus compositus (Poir.) Merr. var. compositus
Copenhagen hawthorn	CRIN3	Crataegus intricata Lange
copper fern	BOHI	Bommeria hispida (Mett. ex Kuhn) Underwood
Coronilla varia L.	SEVA4	Coronilla varia L.
cosmopolitan bulrush	SCMA8	Schoenoplectus maritimus (L.) Lye
cotoneaster	COIN16	Cotoneaster integerrimus Medik.
Cottet willow	SACO28	Salix ×cottetii Kerner
crapemyrtle	LAIN	Lagerstroemia indica L.
creeping bluestem	SCSCS3	Schizachyrium scoparium (Michx.) Nash var. stoloniferum (Nash) J. Wipff
creeping meadow foxtail	ALAR	Alopecurus arundinaceus Poir.
crested wheatgrass	AGCR	Agropyron cristatum (L.) Gaertn.
crimson clover	TRIN3	Trifolium incarnatum L.
crossvine	BICA	Bignonia capreolata L.
crown brodiaea	BRCO3	Brodiaea coronaria (Salisb.) Engl.
crownvetch	SEVA4	Securigera varia (L.) Lassen
crowpoison	NOBI2	Nothoscordum bivalve (L.) Britt.
cucumberleaf sunflower	HEDED	Helianthus debilis Nutt. ssp. debilis
cup plant	SIPE2	Silphium perfoliatum L.
cup plant	SIPEC2	Silphium perfoliatum L. var. connatum (L.) Cronq.
cup plant	SIPEP	Silphium perfoliatum L. var. perfoliatum
curly pondweed	POCR3	Potamogeton crispus L.
curly-mesquite	HIBE	Hilaria belangeri (Steud.) Nash
Curtis' dropseed	SPCU	Sporobolus curtissii (Vasey ex Beal) Small ex Scribn.
cutover muhly	MUEX	Muhlenbergia expansa (Poir.) Trin.
cutthroat grass	PAAB	Panicum abscissum Swallen
cylinder jointtail grass	COCY	Coelorachis cylindrica (Michx.) Nash
davy mannagrass	GLLE2	Glyceria leptostachya Buckl.
deergrass	MURI2	Muhlenbergia rigens (Benth.) A.S. Hitchc.
deertongue	DICL	Dichanthelium clandestinum (L.) Gould
desert false indigo	AMFR	Amorpha fruticosa L.
desert wheatgrass	AGDE2	Agropyron desertorum (Fisch. ex Link) J.A. Schultes
doubleclaw	PRPA2	Proboscidea parviflora (Woot.) Woot. & Standl.
Douglas iris	IRDO	Iris douglasiana Herbert
Douglas-fir	PSME	Pseudotsuga menziesii (Mirbel) Franco
Drummond's willow	SADR	Salix drummondiana Barratt ex Hook.
dwarf palmetto	SAMI8	Sabal minor (Jacq.) Pers.
eastern baccharis	BAHA	Baccharis halimifolia L.
eastern cottonwood	PODE3	Populus deltoides Bartr. ex Marsh.
Eastern Mojave buckwheat	ERFA2	Eriogonum fasciculatum Benth.
eastern purple coneflower	ECPU	Echinacea purpurea (L.) Moench
eastern redbud	CECA4	Cercis canadensis L.
eastern redcedar	JUVI	Juniperus virginiana L.
eastern sandcherry	PRPUD	Prunus pumila L. var. depressa (Pursh) Gleason
eastern white pine	PIST	Pinus strobus L.
eggplant	SOME	Solanum melongena L.
elegant lupine	LUEL4	Lupinus elegans Kunth
Elliott's bluestem	ANGYG	Andropogon gyrans Ashe var. gyrans
Engelmann spruce	PIEN	Picea engelmannii Parry ex Engelm.
Euonymus americana L. [orthographic variant]	EUAM9	Euonymus americana L. [orthographic variant]
Euonymus bungeanum Maxim. [orthographic variant]	EUBU5	Euonymus bungeanum Maxim. [orthographic variant]
European alder	ALGL2	Alnus glutinosa (L.) Gaertn.
fall panicgrass	PADI	Panicum dichotomiflorum Michx.
fall witchgrass	DICO6	Digitaria cognata (J.A. Schultes) Pilger
false Rhodes grass	TRCR9	Trichloris crinita (Lag.) Parodi
fanleaf hawthorn	CRFL	Crataegus flabellata (Spach) Kirchn.
Fernald's iris	IRFE	Iris fernaldii R.C. Foster
Festuca roemeri (Pavlick) Alexeev	FEIDR2	Festuca roemeri (Pavlick) Alexeev
Festuca trachyphylla (Hack.) Krajina nom. illeg.	7-Feb	Festuca trachyphylla (Hack.) Krajina nom. illeg.
field brome	BRAR5	Bromus arvensis L.
field sagewort	ARCAC	Artemisia campestris L. ssp. caudata (Michx.) Hall & Clements
fireberry hawthorn	CRCH	Crataegus chrysocarpa Ashe
firecracker penstemon	PEEA	Penstemon eatonii Gray
firecracker penstemon	PEEAE2	Penstemon eatonii Gray ssp. eatonii
firecracker penstemon	PEEAE	Penstemon eatonii Gray ssp. exsertus (A. Nels.) Keck
firecracker penstemon	PEEAU	Penstemon eatonii Gray ssp. undosus (M.E. Jones) Keck
flat pea	LASY	Lathyrus sylvestris L.
flexible ceanothus	CEFL4	Ceanothus ×flexilis Greene ex McMinn [cuneatus × prostratus]
floating bur-reed	SPFL	Sparganium fluctuans (Engelm. ex Morong) B.L. Robins.
Florida dropseed	SPFL3	Sporobolus floridanus Chapman
Florida paspalum	PAFL4	Paspalum floridanum Michx.
Florida threeawn	ARRH	Aristida rhizomophora Swallen
flowering dogwood	COFL2	Cornus florida L.
forage kochia	BAPR5	Bassia prostrata (L.) A.J. Scott
fourwing saltbush	ATCA2	Atriplex canescens (Pursh) Nutt.
fowl mannagrass	GLST	Glyceria striata (Lam.) A.S. Hitchc.
fox sedge	CAVU2	Carex vulpinoidea Michx.
fragrant sumac	RHAR4	Rhus aromatica Ait.
fragrant sumac	RHARA	Rhus aromatica Ait. var. arenaria (Greene) Fern.
fragrant sumac	RHARA2	Rhus aromatica Ait. var. aromatica
fragrant sumac	RHARS	Rhus aromatica Ait. var. serotina (Greene) Rehd.
Fremont cottonwood	POFR2	Populus fremontii S. Wats.
fringed redmaids	CACI2	Calandrinia ciliata (Ruiz & Pavón) DC.
frosted mint	POIN3	Poliomintha incana (Torr.) Gray
geranium aralia	POGU	Polyscias guilfoylei (Bull ex Cogn. & E. March.) Bailey
giant cane	ARGI	Arundinaria gigantea (Walt.) Muhl.
giant sandreed	CAGI3	Calamovilfa gigantea (Nutt.) Scribn. & Merr.
ginkgo	GINKG	Ginkgo L.
glassy onion	ALHY	Allium hyalinum Curran
Glyceria elata (Nash ex Rydb.) M.E. Jones	GLST	Glyceria elata (Nash ex Rydb.) M.E. Jones
golden currant	RIAU	Ribes aureum Pursh
golden currant	RIAUA	Ribes aureum Pursh var. aureum
golden currant	RIAUG	Ribes aureum Pursh var. gracillimum (Coville & Britt.) Jepson
golden currant	RIAUV	Ribes aureum Pursh var. villosum DC.
golden tickseed	COTI3	Coreopsis tinctoria Nutt.
goldenseal	HYCA	Hydrastis canadensis L.
grand fir	ABGR	Abies grandis (Dougl. ex D. Don) Lindl.
gray alder	ALIN2	Alnus incana (L.) Moench
gray birch	BEPO	Betula populifolia Marsh.
gray dogwood	CORA6	Cornus racemosa Lam.
greasewood	SAVE4	Sarcobatus vermiculatus (Hook.) Torr.
great blue lobelia	LOSI	Lobelia siphilitica L.
Great Lakes wheatgrass	ELLAP	Elymus lanceolatus (Scribn. & J.G. Sm.) Gould ssp. psammophilus (Gillett & Senn) A. Löve
green antelopehorn	ASVI2	Asclepias viridis Walt.
green arrow arum	PEVI	Peltandra virginica (L.) Schott
green ash	FRPE	Fraxinus pennsylvanica Marsh.
green needlegrass	NAVI4	Nassella viridula (Trin.) Barkworth
green silkyscale	ANVI4	Anthaenantia villosa (Michx.) Beauv.
green sprangletop	LEDU	Leptochloa dubia (Kunth) Nees
greenleaf manzanita	ARPA6	Arctostaphylos patula Greene
groundnut	APAM	Apios americana Medik.
gulf bluestem	SCMA3	Schizachyrium maritimum (Chapman) Nash
gulf cordgrass	SPSP	Spartina spartinae (Trin.) Merr. ex A.S. Hitchc.
gypsum grama	BOBR	Bouteloua breviseta Vasey
hairy manzanita	ARCO3	Arctostaphylos columbiana Piper
hard fescue	7-Feb	Festuca brevipila Tracey
harlequin blueflag	IRVE2	Iris versicolor L.
Havard's panicgrass	PAHA2	Panicum havardii Vasey
hazel alder	ALSE2	Alnus serrulata (Ait.) Willd.
heartleaf milkweed	ASCO	Asclepias cordifolia (Benth.) Jepson
henbit deadnettle	LAAM	Lamium amplexicaule L.
herbaceous penstemon	PERYO	Penstemon rydbergii A. Nels. var. oreocharis (Greene) N. Holmgren
hollyleaf cherry	PRIL	Prunus ilicifolia (Nutt. ex Hook. & Arn.) D. Dietr.
honey mesquite	PRGL2	Prosopis glandulosa Torr.
honeylocust	GLTR	Gleditsia triacanthos L.
hooded windmill grass	CHCU2	Chloris cucullata Bisch.
Idaho fescue	FEID	Festuca idahoensis Elmer
incense cedar	CADE27	Calocedrus decurrens (Torr.) Florin
Indian heliotrope	HEIN	Heliotropium indicum L.
Indian ricegrass	ACHY	Achnatherum hymenoides (Roemer & J.A. Schultes) Barkworth
Indian woodoats	CHLA5	Chasmanthium latifolium (Michx.) Yates
Indiangrass	SONU2	Sorghastrum nutans (L.) Nash
Indianhemp	APCA	Apocynum cannabinum L.
Indian-tobacco	LOIN	Lobelia inflata L.
Indigofera miniata Ortega var. leptosepala (Nutt. ex Torr. & Gray) B.L. Turner	INMI	Indigofera miniata Ortega var. leptosepala (Nutt. ex Torr. & Gray) B.L. Turner
inkberry	ILGL	Ilex glabra (L.) Gray
interior live oak	QUWI2	Quercus wislizeni A. DC.
intermediate wheatgrass	THIN6	Thinopyrum intermedium (Host) Barkworth & D.R. Dewey
Intsia bijuga (Colebr.) Kuntze	INBI	Intsia bijuga (Colebr.) Kuntze
Italian ryegrass	LOPEM2	Lolium perenne L. ssp. multiflorum (Lam.) Husnot
jack pine	PIBA2	Pinus banksiana Lamb.
Japanese black pine	PITH2	Pinus thunbergii Parl.
Japanese clover	KUST2	Kummerowia striata (Thunb.) Schindl.
Jeffrey pine	PIJE	Pinus jeffreyi Grev. & Balf.
Jersey tea	CEHE	Ceanothus herbaceus Raf.
Jesuit's bark	IVFR	Iva frutescens L.
Juncus balticus Willd.	JUARL	Juncus balticus Willd.
Kamchatka fritillary	FRCA5	Fritillaria camschatcensis (L.) Ker-Gawl.
Kansas hawthorn	CRCO2	Crataegus coccinioides Ashe
Kentucky bluegrass	POPR	Poa pratensis L.
Kentucky coffeetree	GYDI	Gymnocladus dioicus (L.) K. Koch
kinnikinnick	ARUV	Arctostaphylos uva-ursi (L.) Spreng.
knotgrass	PADI6	Paspalum distichum L.
Kochia prostrata (L.) Schrad.	BAPR5	Kochia prostrata (L.) Schrad.
Korean clover	KUST	Kummerowia stipulacea (Maxim.) Makino
lanceleaf tickseed	COLA5	Coreopsis lanceolata L.
large beardtongue	PEGR7	Penstemon grandiflorus Nutt.
leatherleaf	CHCA2	Chamaedaphne calyculata (L.) Moench
Lemmon's needlegrass	ACLE8	Achnatherum lemmonii (Vasey) Barkworth
Lemmon's willow	SALE	Salix lemmonii Bebb
leopard lily	LIPA	Lilium pardalinum Kellogg
Lewis flax	LILE3	Linum lewisii Pursh
Lewis' mock orange	PHLE4	Philadelphus lewisii Pursh
Lindheimer's muhly	MULI	Muhlenbergia lindheimeri A.S. Hitchc.
little bluestem	SCSC	Schizachyrium scoparium (Michx.) Nash
little walnut	JUMI	Juglans microcarpa Berl.
littleleaf leadtree	LERE5	Leucaena retusa Benth.
live oak	QUVI	Quercus virginiana P. Mill.
Lolium arundinaceum (Schreb.) S.J. Darbyshire	SCPH	Lolium arundinaceum (Schreb.) S.J. Darbyshire
longleaf pine	PIPA2	Pinus palustris P. Mill.
longtom	PADE24	Paspalum denticulatum Trin.
lopsided Indiangrass	SOSE5	Sorghastrum secundum (Ell.) Nash
low beardtongue	PEHU	Penstemon humilis Nutt. ex Gray
lyreleaf sage	SALY2	Salvia lyrata L.
MacKenzie's willow	SAPR3	Salix prolixa Anderss.
maidencane	PAHE2	Panicum hemitomon J.A. Schultes
mango	MAIN3	Mangifera indica L.
marsh bristlegrass	SEPA10	Setaria parviflora (Poir.) Kerguélen
Maryland meadowbeauty	RHMA	Rhexia mariana L.
Maximilian sunflower	HEMA2	Helianthus maximiliani Schrad.
may hawthorn	CRAE	Crataegus aestivalis (Walt.) Torr. & Gray
meadow barley	HOBR2	Hordeum brachyantherum Nevski
meadow beardtongue	PERYA	Penstemon rydbergii A. Nels. var. aggregatus (Pennell) N. Holmgren
meadow brome	BRBI2	Bromus biebersteinii Roemer & J.A. Schultes [excluded]
Mexican whorled milkweed	ASFA	Asclepias fascicularis Dcne.
Monterey pine	PIRA2	Pinus radiata D. Don
mormon tea	EPVI	Ephedra viridis Coville
mountain big sagebrush	ARTRV	Artemisia tridentata Nutt. ssp. vaseyana (Rydb.) Beetle
mountain brome	BRMA4	Bromus marginatus Nees ex Steud.
mucronate penstemon	PEPAM5	Penstemon pachyphyllus Gray ex Rydb. var. mucronatus (N. Holmgren) Neese
Muhlenbergia capillaris (Lam.) Trin. var. trichopodes (Ell.) Vasey	MUEX	Muhlenbergia capillaris (Lam.) Trin. var. trichopodes (Ell.) Vasey
multiflower false Rhodes grass	TRPL3	Trichloris pluriflora Fourn.
muttongrass	POFE	Poa fendleriana (Steud.) Vasey
Myrica pusilla Raf.	MOCE2	Myrica pusilla Raf.
narrowleaf bur-reed	SPAN2	Sparganium angustifolium Michx.
narrowleaf cottonwood	POAN3	Populus angustifolia James
narrowleaf silkgrass	PIGR4	Pityopsis graminifolia (Michx.) Nutt.
narrowleaf willow	SAEX	Salix exigua Nutt.
Nebraska sedge	CANE2	Carex nebrascensis Dewey
needle and thread	HECO26	Hesperostipa comata (Trin. & Rupr.) Barkworth
needle and thread	HECOC8	Hesperostipa comata (Trin. & Rupr.) Barkworth ssp. comata
needlegrass rush	JURO	Juncus roemerianus Scheele
Nevada jointfir	EPNE	Ephedra nevadensis S. Wats.
New England aster	SYNO2	Symphyotrichum novae-angliae (L.) Nesom
New Jersey tea	CEAM	Ceanothus americanus L.
New York aster	SYNON	Symphyotrichum novi-belgii (L.) Nesom var. novi-belgii
nodding needlegrass	NACE	Nassella cernua (Stebbins & R.M. Love) Barkworth
Nootka lupine	LUNO	Lupinus nootkatensis Donn ex Sims
northern bayberry	MOPE6	Morella pensylvanica (Mirbel) Kartesz
northern bur-reed	SPHY	Sparganium hyperboreum Beurling ex Laestad.
northern catalpa	CASP8	Catalpa speciosa (Warder) Warder ex Engelm.
northern pin oak	QUEL	Quercus ellipsoidalis E.J. Hill
northern red oak	QURU	Quercus rubra L.
northern spicebush	LIBE3	Lindera benzoin (L.) Blume
northern spicebush	LIBEB	Lindera benzoin (L.) Blume var. benzoin
northern spicebush	LIBEP	Lindera benzoin (L.) Blume var. pubescens (Palmer & Steyermark) Rehd.
northern sweetgrass	HIHIA	Hierochloe hirta (Schrank) Borbás ssp. arctica (J. Presl) G. Weim.
northwestern mannagrass	GLOC	Glyceria occidentalis (Piper) J.C. Nels.
nutgrass	CYRO	Cyperus rotundus L.
Nuttall's prairie parsley	PONU4	Polytaenia nuttallii DC.
Ohio buckeye	AEGL	Aesculus glabra Willd.
oneleaf onion	ALUN	Allium unifolium Kellogg
Opuntia acanthocarpa Engelm. & Bigelow	CYACA2	Opuntia acanthocarpa Engelm. & Bigelow
orchardgrass	DAGL	Dactylis glomerata L.
Oregon white oak	QUGA4	Quercus garryana Dougl. ex Hook.
ovate false fiddleleaf	HYOV	Hydrolea ovata Nutt. ex Choisy
overcup oak	QULY	Quercus lyrata Walt.
Pacific beach strawberry	FRCHP	Fragaria chiloensis (L.) P. Mill. ssp. pacifica Staudt
Pacific madrone	ARME	Arbutus menziesii Pursh
Pacific ninebark	PHCA11	Physocarpus capitatus (Pursh) Kuntze
Pacific silver fir	ABAM	Abies amabilis (Dougl. ex Loud.) Dougl. ex Forbes
Pacific silverweed	AREG	Argentina egedii (Wormsk.) Rydb.
Pacific willow	SALUL	Salix lucida Muhl. ssp. lasiandra (Benth.) E. Murr.
pale false mannagrass	TOPAP3	Torreyochloa pallida (Torr.) Church var. pauciflora (J. Presl) J.I. Davis
pale purple coneflower	ECPA	Echinacea pallida (Nutt.) Nutt.
Palmer's penstemon	PEPA8	Penstemon palmeri Gray
Palmer's penstemon	PEPAP9	Penstemon palmeri Gray var. palmeri
Panicum scribnerianum Nash	DIOLS	Panicum scribnerianum Nash
paper birch	BEPA	Betula papyrifera Marsh.
partridge pea	CHFA2	Chamaecrista fasciculata (Michx.) Greene
Paspalum lividum Trin.	PADE24	Paspalum lividum Trin.
pawpaw	ASTR	Asimina triloba (L.) Dunal
peachleaf willow	SAAM2	Salix amygdaloides Anderss.
pear hawthorn	CRCA	Crataegus calpodendron (Ehrh.) Medik.
pecan	CAIL2	Carya illinoinensis (Wangenh.) K. Koch
Pennsylvania smartweed	POPE2	Polygonum pensylvanicum L.
perennial pea	LALA4	Lathyrus latifolius L.
perennial ryegrass	LOPE	Lolium perenne L.
Philadelphia fleabane	ERPH	Erigeron philadelphicus L.
pickerelweed	POCO14	Pontederia cordata L.
pin oak	QUPA2	Quercus palustris Muenchh.
Pinchot's juniper	JUPI	Juniperus pinchotii Sudworth
pineland threeawn	ARST5	Aristida stricta Michx.
pinemat manzanita	ARNE	Arctostaphylos nevadensis Gray
pineywoods dropseed	SPJU	Sporobolus junceus (Beauv.) Kunth
pink pappusgrass	PABI2	Pappophorum bicolor Fourn.
pinnate prairie coneflower	RAPI	Ratibida pinnata (Vent.) Barnh.
plains bristlegrass	SEVU2	Setaria vulpiseta (Lam.) Roemer & J.A. Schultes
plains lovegrass	ERIN	Eragrostis intermedia A.S. Hitchc.
Poa scabrella (Thurb.) Benth. ex Vasey	POSE	Poa scabrella (Thurb.) Benth. ex Vasey
ponderosa pine	PIPO	Pinus ponderosa P.& C. Lawson
prairie acacia	ACAN	Acacia angustissima (P. Mill.) Kuntze
prairie blazing star	LIPY	Liatris pycnostachya Michx.
prairie cordgrass	SPPE	Spartina pectinata Bosc ex Link
prairie Junegrass	KOMA	Koeleria macrantha (Ledeb.) J.A. Schultes
prairie sagewort	ARFR4	Artemisia frigida Willd.
prairie sandreed	CALO	Calamovilfa longifolia (Hook.) Scribn.
prairie threeawn	AROL	Aristida oligantha Michx.
prairie willow	SAHU2	Salix humilis Marsh.
pubescent skunkbush sumac	RHTRP	Rhus trilobata Nutt. var. pilosissima Engelm.
Purdy's iris	IRPU	Iris purdyi Eastw.
purple loosestrife	LYSA2	Lythrum salicaria L.
purple lovegrass	ERSP	Eragrostis spectabilis (Pursh) Steud.
purple passionflower	PAIN6	Passiflora incarnata L.
purple prairie clover	DAPU5	Dalea purpurea Vent.
purpleosier willow	SAPU2	Salix purpurea L.
purpletop tridens	TRFL2	Tridens flavus (L.) A.S. Hitchc.
quaking aspen	POTR5	Populus tremuloides Michx.
rattlesnakemaster	ERAQ	Eryngium aquaticum L.
red alder	ALRU2	Alnus rubra Bong.
red clover	TRPR2	Trifolium pratense L.
red columbine	AQCA	Aquilegia canadensis L.
red elderberry	SARA2	Sambucus racemosa L.
red fescue	FERU2	Festuca rubra L.
red fescue	FERUA3	Festuca rubra L. ssp. arenaria (Osbeck) F. Aresch.
red grama	BOTR2	Bouteloua trifida Thurb.
red maple	ACRU	Acer rubrum L.
red mulberry	MORU2	Morus rubra L.
red pine	PIRE	Pinus resinosa Ait.
red spruce	PIRU	Picea rubens Sarg.
redosier dogwood	COSE16	Cornus sericea L.
redosier dogwood	COSES	Cornus sericea L. ssp. sericea
redtop	AGGI2	Agrostis gigantea Roth
reed canarygrass	PHAR3	Phalaris arundinacea L.
Rhus hirta (L.) Sudworth	RHTY	Rhus hirta (L.) Sudworth
rice cutgrass	LEOR	Leersia oryzoides (L.) Sw.
river birch	BENI	Betula nigra L.
riverflat hawthorn	CROP	Crataegus opaca Hook. & Arn.
Rocky Mountain iris	IRMI	Iris missouriensis Nutt.
Rocky Mountain juniper	JUSC2	Juniperus scopulorum Sarg.
Rocky Mountain maple	ACGL	Acer glabrum Torr.
Rocky Mountain penstemon	PEST2	Penstemon strictus Benth.
Roemer's fescue	FEIDR2	Festuca idahoensis Elmer ssp. roemeri (Pavlick) S. Aiken
rose clover	TRHI4	Trifolium hirtum All.
roundhead lespedeza	LECA8	Lespedeza capitata Michx.
rugosa rose	RORU	Rosa rugosa Thunb.
russet buffaloberry	SHCA	Shepherdia canadensis (L.) Nutt.
Russian wildrye	PSJU3	Psathyrostachys juncea (Fisch.) Nevski
Rydberg's penstemon	PERY	Penstemon rydbergii A. Nels.
sacahuista	NOMI	Nolina microcarpa S. Wats.
saguaro	CAGI10	Carnegiea gigantea (Engelm.) Britt. & Rose
sainfoin	ONVI	Onobrychis viciifolia Scop.
salmonberry	RUSP	Rubus spectabilis Pursh
salt rush	JULE	Juncus lesueurii Boland.
saltgrass	DISP	Distichlis spicata (L.) Greene
saltmarsh fingergrass	EUGL5	Eustachys glauca Chapman
saltmeadow cordgrass	SPPA	Spartina patens (Ait.) Muhl.
Sambucus nigra L. ssp. cerulea (Raf.) R. Bolli [orthographic variant]	SANIC6	Sambucus nigra L. ssp. cerulea (Raf.) R. Bolli [orthographic variant]
sand bluestem	ANHA	Andropogon hallii Hack.
sand cordgrass	SPBA	Spartina bakeri Merr.
sand dropseed	SPCR	Sporobolus cryptandrus (Torr.) Gray
sand lovegrass	ERTR3	Eragrostis trichodes (Nutt.) Wood
Sandberg bluegrass	POSE	Poa secunda J. Presl
Sandwich beach strawberry	FRCHS2	Fragaria chiloensis (L.) P. Mill. ssp. sandwicensis (Dcne.) Staudt
Santa Barbara sedge	CABA4	Carex barbarae Dewey
Saskatoon serviceberry	AMAL2	Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer
Saskatoon serviceberry	AMALS	Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer var. semiintegrifolia (Hook.) C.L. Hitchc.
sassafras	SAAL5	Sassafras albidum (Nutt.) Nees
sawtooth oak	QUAC80	Quercus acutissima Carruthers
scented beardtongue	PEPAE2	Penstemon palmeri Gray var. eglandulosus (Keck) N. Holmgren
scented beardtongue	PEPAM3	Penstemon palmeri Gray var. macranthus (Eastw.) N. Holmgren
Scots pine	PISY	Pinus sylvestris L.
screwbean mesquite	PRPU	Prosopis pubescens Benth.
Scribner's rosette grass	DIOLS	Dichanthelium oligosanthes (J.A. Schultes) Gould var. scribnerianum (Nash) Gould
seashore dropseed	SPVI3	Sporobolus virginicus (L.) Kunth
seashore paspalum	PAVA	Paspalum vaginatum Sw.
seep muhly	MURE2	Muhlenbergia reverchonii Vasey & Scribn.
sericea lespedeza	LECU	Lespedeza cuneata (Dum.-Cours.) G. Don
shellbark hickory	CALA21	Carya laciniosa (Michx. f.) G. Don
shining willow	SALU	Salix lucida Muhl.
shore juniper	JUCO12	Juniperus conferta Parl.
shore little bluestem	SCLI11	Schizachyrium littorale (Nash) Bickn.
shorttooth Canadian milkvetch	ASCAB	Astragalus canadensis L. var. brevidens (Gandog.) Barneby
showy milkweed	ASSP	Asclepias speciosa Torr.
showy ticktrefoil	DECA7	Desmodium canadense (L.) DC.
shrub lespedeza	LEBI2	Lespedeza bicolor Turcz.
Shumard's oak	QUSH	Quercus shumardii Buckl.
shyleaf	AEAM	Aeschynomene americana L.
Siberian peashrub	CAAR18	Caragana arborescens Lam.
Siberian wheatgrass	AGFR	Agropyron fragile (Roth) P. Candargy
sicklekeel lupine	LUAL3	Lupinus albicaulis Dougl.
sideoats grama	BOCU	Bouteloua curtipendula (Michx.) Torr.
silky dogwood	COAM2	Cornus amomum P. Mill.
silver bluestem	BOSA	Bothriochloa saccharoides (Sw.) Rydb.
silver buffaloberry	SHAR	Shepherdia argentea (Pursh) Nutt.
silver maple	ACSA2	Acer saccharinum L.
silverberry	ELCO	Elaeagnus commutata Bernh. ex Rydb.
silverleaf nightshade	SOEL	Solanum elaeagnifolium Cav.
simplestem bur-reed	SPER	Sparganium erectum L.
simplestem bur-reed	SPERS2	Sparganium erectum L. ssp. stoloniferum (Graebn.) Hara
singleleaf pinyon	PIMO	Pinus monophylla Torr. & Frém.
Sitka spruce	PISI	Picea sitchensis (Bong.) Carr.
Sitka willow	SASI2	Salix sitchensis Sanson ex Bong.
skunkbush sumac	RHTR	Rhus trilobata Nutt.
skunkbush sumac	RHTRA	Rhus trilobata Nutt. var. anisophylla (Greene) Jepson
skunkbush sumac	RHTRQ	Rhus trilobata Nutt. var. quinata (Greene) Jepson
skunkbush sumac	RHTRR	Rhus trilobata Nutt. var. racemulosa (Greene) Barkl.
skunkbush sumac	RHTRS	Rhus trilobata Nutt. var. simplicifolia (Greene) Barkl.
skunkbush sumac	RHTRT	Rhus trilobata Nutt. var. trilobata
slash pine	PIEL	Pinus elliottii Engelm.
slender hairgrass	DEEL	Deschampsia elongata (Hook.) Munro
slender little bluestem	SCTE5	Schizachyrium tenerum Nees
slender wheatgrass	ELTR7	Elymus trachycaulus (Link) Gould ex Shinners
slender wheatgrass	ELTRT	Elymus trachycaulus (Link) Gould ex Shinners ssp. trachycaulus
slim tridens	TRMU	Tridens muticus (Torr.) Nash
slough sedge	CAOB3	Carex obnupta Bailey
small burnet	SAMI3	Sanguisorba minor Scop.
small bur-reed	SPNA	Sparganium natans L.
small camas	CAQUB2	Camassia quamash (Pursh) Greene ssp. breviflora Gould
small camas	CAQUQ	Camassia quamash (Pursh) Greene ssp. quamash
smooth blue aster	SYLAL3	Symphyotrichum laeve (L.) A.& D. Löve var. laeve
smooth brome	BRIN2	Bromus inermis Leyss.
smooth cordgrass	SPAL	Spartina alterniflora Loisel.
smooth oxeye	HEHES	Heliopsis helianthoides (L.) Sweet var. scabra (Dunal) Fern.
smooth sumac	RHGL	Rhus glabra L.
Snake River wheatgrass	ELWA2	Elymus wawawaiensis J. Carlson & Barkworth
snow buckwheat	ERNI2	Eriogonum niveum Dougl. ex Benth.
soft brome	BRHOH	Bromus hordeaceus L. ssp. hordeaceus
softstem bulrush	SCTA2	Schoenoplectus tabernaemontani (K.C. Gmel.) Palla
sortbeard plumegrass	SABRC3	Saccharum brevibarbe (Michx.) Pers. var. contortum (Ell.) R. Webster
southern catalpa	CABI8	Catalpa bignonioides Walt.
southern crabapple	MAAN3	Malus angustifolia (Ait.) Michx.
Spanish moss	TIUS	Tillandsia usneoides (L.) L.
speckled alder	ALINR	Alnus incana (L.) Moench ssp. rugosa (Du Roi) Clausen
spike bentgrass	AGEX	Agrostis exarata Trin.
splitbeard bluestem	ANTE2	Andropogon ternarius Michx.
spotted beebalm	MOPU	Monarda punctata L.
squirreltail	ELEL5	Elymus elymoides (Raf.) Swezey
St. Andrew's cross	HYHYH	Hypericum hypericoides (L.) Crantz ssp. hypericoides
staghorn sumac	RHTY	Rhus typhina L.
stiff dogwood	COFO	Cornus foemina P. Mill.
stiff goldenrod	OLRIR	Oligoneuron rigidum (L.) Small var. rigidum
stiff sunflower	HEPA19	Helianthus pauciflorus Nutt.
strand tangantangan	SCFO2	Schleinitzia fosbergii L.I.Nevling & Ch.J.Niezgoda
Strophostyles helvula (L.) Ell. [orthographic variant]	STHE9	Strophostyles helvula (L.) Ell. [orthographic variant]
sturdy bulrush	SCRO5	Schoenoplectus robustus (Pursh) M.T. Strong
subalpine fir	ABLA	Abies lasiocarpa (Hook.) Nutt.
sugar maple	ACSA3	Acer saccharum Marsh.
sugarberry	CELA	Celtis laevigata Willd.
sulphur-flower buckwheat	ERUM	Eriogonum umbellatum Torr.
sundial lupine	LUPE3	Lupinus perennis L.
sunn hemp	CRJU	Crotalaria juncea L.
swamp chestnut oak	QUMI	Quercus michauxii Nutt.
swamp rose	ROPA	Rosa palustris Marsh.
swamp tupelo	NYBI	Nyssa biflora Walt.
swamp white oak	QUBI	Quercus bicolor Willd.
sweet fern	COPE80	Comptonia peregrina (L.) Coult.
sweetgrass	HIOD	Hierochloe odorata (L.) Beauv.
sweetgum	LIST2	Liquidambar styraciflua L.
switchcane	ARGIT8	Arundinaria gigantea (Walt.) Muhl. ssp. tecta (Walt.) McClure
switchgrass	PAVI2	Panicum virgatum L.
swollen penstemon	PERYR	Penstemon rydbergii A. Nels. var. rydbergii
tall fescue	SCPH	Schedonorus phoenix (Scop.) Holub
tall flatsedge	CYER	Cyperus eragrostis Lam.
tall oatgrass	AREL3	Arrhenatherum elatius (L.) Beauv. ex J.& K. Presl
tamarack	LALA	Larix laricina (Du Roi) K. Koch
tanglehead	HECO10	Heteropogon contortus (L.) Beauv. ex Roemer & J.A. Schultes
tanoak	LIDE3	Lithocarpus densiflorus (Hook. & Arn.) Rehd.
tarragon	ARDR4	Artemisia dracunculus L.
Tehachapi rose	ROWOG2	Rosa woodsii Lindl. var. gratissima (Greene) Cole
Texas bluegrass	POAR	Poa arachnifera Torr.
Texas cupgrass	ERSE5	Eriochloa sericea (Scheele) Munro ex Vasey
Texas kidneywood	EYTE	Eysenhardtia texana Scheele
Texas wintergrass	NALE3	Nassella leucotricha (Trin. & Rupr.) Pohl
thickleaf beardtongue	PEPA6	Penstemon pachyphyllus Gray ex Rydb.
thickleaf beardtongue	PEPAC2	Penstemon pachyphyllus Gray ex Rydb. var. congestus (M.E. Jones) N. Holmgren
thickleaf beardtongue	PEPAP8	Penstemon pachyphyllus Gray ex Rydb. var. pachyphyllus
thickspike wheatgrass	ELLA3	Elymus lanceolatus (Scribn. & J.G. Sm.) Gould
thickspike wheatgrass	ELLAL	Elymus lanceolatus (Scribn. & J.G. Sm.) Gould ssp. lanceolatus
thin paspalum	PASE5	Paspalum setaceum Michx.
threeflower melicgrass	MENI	Melica nitens (Scribn.) Nutt. ex Piper
threeflower ticktrefoil	DETR4	Desmodium triflorum (L.) DC.
Thunberg's lespedeza	LETH4	Lespedeza thunbergii (DC.) Nakai
Thurber's needlegrass	ACTH7	Achnatherum thurberianum (Piper) Barkworth
timothy	PHPR3	Phleum pratense L.
tobosagrass	PLMU3	Pleuraphis mutica Buckl.
toothache grass	CTAR	Ctenium aromaticum (Walt.) Wood
torpedo grass	PARE3	Panicum repens L.
toyon	HEAR5	Heteromeles arbutifolia (Lindl.) M. Roemer
trumpet creeper	CARA2	Campsis radicans (L.) Seem. ex Bureau
tubercled saltbush	ATAC	Atriplex acanthocarpa (Torr.) S. Wats.
tule	SCACO2	Schoenoplectus acutus (Muhl. ex Bigelow) A.& D. Löve var. occidentalis (S. Wats.) S.G. Sm.
tuliptree	LITU	Liriodendron tulipifera L.
tumble windmill grass	CHVE2	Chloris verticillata Nutt.
twinberry honeysuckle	LOIN5	Lonicera involucrata (Richards.) Banks ex Spreng.
twincrest onion	ALBIB	Allium bisceptrum S. Wats. var. bisceptrum
twoneedle pinyon	PIED	Pinus edulis Engelm.
upright prairie coneflower	RACO3	Ratibida columnifera (Nutt.) Woot. & Standl.
valley oak	QULO	Quercus lobata Née
velvet mesquite	PRVE	Prosopis velutina Woot.
Venus penstemon	PEVE2	Penstemon venustus Dougl. ex Lindl.
vine maple	ACCI	Acer circinatum Pursh
vine mesquite	PAOB	Panicum obtusum Kunth
vinegarweed	TRLA4	Trichostema lanceolatum Benth.
Virginia creeper	PAQU2	Parthenocissus quinquefolia (L.) Planch.
Virginia iris	IRVI	Iris virginica L.
Virginia rose	ROVI2	Rosa virginiana P. Mill.
Virginia rose	ROVIL	Rosa virginiana P. Mill. var. lamprophylla (Rydb.) Fern.
Virginia rose	ROVIV2	Rosa virginiana P. Mill. var. virginiana
Virginia spiderwort	TRVI	Tradescantia virginiana L.
Virginia strawberry	FRVI	Fragaria virginiana Duchesne
Virginia wildrye	ELVI3	Elymus virginicus L.
water birch	BEOC2	Betula occidentalis Hook.
wavyleaf soap plant	CHPO3	Chlorogalum pomeridianum (DC.) Kunth
wax myrtle	MOCE2	Morella cerifera (L.) Small
weeping lovegrass	ERCU2	Eragrostis curvula (Schrad.) Nees
western chokecherry	PRVID	Prunus virginiana L. var. demissa (Nutt.) Torr.
western dogwood	COSEO	Cornus sericea L. ssp. occidentalis (Torr. & Gray) Fosberg
western honey mesquite	PRGLT	Prosopis glandulosa Torr. var. torreyana (L. Benson) M.C. Johnston
western needlegrass	ACOC3	Achnatherum occidentale (Thurb.) Barkworth
western red cedar	THPL	Thuja plicata Donn ex D. Don
western wheatgrass	PASM	Pascopyrum smithii (Rydb.) A. Löve
western white clematis	CLLI2	Clematis ligusticifolia Nutt.
western yarrow	ACMIO	Achillea millefolium L. var. occidentalis DC.
white ash	FRAM2	Fraxinus americana L.
white fir	ABCO	Abies concolor (Gord. & Glend.) Lindl. ex Hildebr.
white heath aster	SYERE	Symphyotrichum ericoides (L.) Nesom var. ericoides
white mulberry	MOAL	Morus alba L.
white oak	QUAL	Quercus alba L.
white panicle aster	SYLAL4	Symphyotrichum lanceolatum (Willd.) Nesom ssp. lanceolatum var. lanceolatum
white sage	SAAP2	Salvia apiana Jepson
white sagebrush	ARLU	Artemisia ludoviciana Nutt.
white spruce	PIGL	Picea glauca (Moench) Voss
white tridens	TRAL2	Tridens albescens (Vasey) Woot. & Standl.
whitemouth dayflower	COER	Commelina erecta L.
whitemouth dayflower	COERA	Commelina erecta L. var. angustifolia (Michx.) Fern.
whitethorn ceanothus	CECO	Ceanothus cordulatus Kellogg
whitewhorl lupine	LUDEA	Lupinus densiflorus Benth. var. aureus (Kellogg) Munz
wild bergamot	MOFI	Monarda fistulosa L.
wild quinine	PAIN3	Parthenium integrifolium L.
willow oak	QUPH	Quercus phellos L.
winged sumac	RHCO	Rhus copallinum L.
wingleaf primrose-willow	LUDE4	Ludwigia decurrens Walt.
winterberry euonymus	EUBU5	Euonymus bungeanus Maxim.
winterfat	KRLA2	Krascheninnikovia lanata (Pursh) A.D.J. Meeuse & Smit
woodland strawberry	FRVE	Fragaria vesca L.
Woods' rose	ROWO	Rosa woodsii Lindl.
Woods' rose	ROWOG	Rosa woodsii Lindl. var. glabrata (Parish) Cole
Woods' rose	ROWOU	Rosa woodsii Lindl. var. ultramontana (S. Wats.) Jepson
Woods' rose	ROWOW	Rosa woodsii Lindl. var. woodsii
woolgrass	SCCY	Scirpus cyperinus (L.) Kunth
Wright's threeawn	ARPUW	Aristida purpurea Nutt. var. wrightii (Nash) Allred
Wyoming big sagebrush	ARTRW8	Artemisia tridentata Nutt. ssp. wyomingensis Beetle & Young
yaupon	ILVO	Ilex vomitoria Ait.
yellow birch	BEAL2	Betula alleghaniensis Britt.
yellow fringed orchid	PLCI2	Platanthera ciliaris (L.) Lindl.
yellow mariposa	CASU3	Calochortus superbus Purdy ex J.T. Howell
yellow mariposa lily	CALU9	Calochortus luteus Dougl. ex Lindl.
yellow pond-lily	NULU	Nuphar lutea (L.) Sm.
yellow sundrops	CASE12	Calylophus serrulatus (Nutt.) Raven
yellowleaf hawthorn	CRFL2	Crataegus flava Ait.
yerba mansa	ANCA10	Anemopsis californica (Nutt.) Hook. & Arn.
Yucca whipplei Torr.	HEWH	Yucca whipplei Torr.

Attribution:  U.S. Department of Agriculture