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2419 Plants Found

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Ordered by common name.

Scientific Name	Common Name	†	Map‡
Bromus sterilis L.	poverty brome
Danthonia spicata (L.) P. Beauv. ex Roem. & Schult.	Poverty Oatgrass
Juncus tenuis Willd.	poverty rush
Iva axillaris Pursh	povertyweed
Amaranthus powellii S. Watson	Powell's Amaranth
Atriplex powellii S. Watson	Powell's saltweed
Sanguisorba annua (Nutt. ex Hook.) Nutt. ex Torr. & A. Gray	Prairie Burnet
Spartina pectinata Bosc ex Link	Prairie Cordgrass
Erigeron strigosus Muhl. ex Willd.	Prairie Fleabane
Packera plattensis (Nutt.) W.A. Weber & Á. Löve	prairie groundsel
Koeleria macrantha (Ledeb.) Schult.	Prairie Junegrass
Helianthus petiolaris Nutt.	Prairie Sunflower
Cirsium canescens Nutt.	prairie thistle
Sphenopholis obtusata (Michx.) Scribn.	Prairie Wedgescale
Carex preslii Steud.	Presl's sedge
Cryptantha echinella Greene	prickly cryptantha
Ribes lacustre (Pers.) Poir.	prickly currant
Lactuca serriola L.	Prickly Lettuce	✓
Rosa acicularis Lindl.	Prickly Rose
Salsola tragus L.	prickly Russian thistle
Eremogone aculeata (S.Watson) Ikonn.	Prickly Sandwort
Mimulus primuloides Benth.	primrose monkeyflower
Pogogyne floribunda Jokerst	Profuseflower Mesamint
Panicum miliaceum L.	proso millet
Ceanothus prostratus Benth.	prostrate ceanothus
Hornungia procumbens (L.) Hayek	prostrate hutchinsia
Amaranthus albus L.	Prostrate Pigweed
Muhlenbergia filiformis (Thurb. ex S. Watson) Rydb.	pullup muhly
Tribulus terrestris L.	puncturevine
Geum rivale L.	Purple Avens
Cordylanthus parviflorus (Ferris) Wiggins	Purple Bird's-Beak
Erigeron poliospermus A. Gray	purple cushion fleabane
Lamium purpureum L.	Purple Deadnettle
Lythrum salicaria L.	Purple Loosestrife
Comarum palustre L.	purple marshlocks
Thalictrum dasycarpum Fisch. & Avé-Lall.	Purple Meadow-rue
Astragalus agrestis Douglas ex G. Don	purple milkvetch
Mimulus lewisii Pursh	purple monkeyflower
Saxifraga oppositifolia L.	purple mountain saxifrage
Melica spectabilis Scribn.	purple oniongrass
Calamagrostis purpurascens R. Br.	purple reedgrass
Salvia dorrii (Kellogg) Abrams	purple sage
Osmorhiza purpurea (J.M. Coult. & Rose) Suksd.	purple sweetroot
Aristida purpurea Nutt.	Purple Threeawn
Suaeda calceoliformis (Hook.) Moq.	Pursh Seepweed
Gentiana prostrata Haenke	Pygmy Gentian
Androsace septentrionalis L.	pygmyflower rockjasmine
Elymus repens (L.) Gould	Quackgrass
Populus tremuloides Michx.	Quaking Aspen
Daucus carota L.	Queen Anne's lace
Cryptantha affinis (A. Gray) Greene	quill cryptantha
Erigeron gracilis Rydb.	Quill Fleabane
Ericameria bloomeri (A. Gray) J.F. Macbr.	rabbitbush
Trifolium arvense L.	Rabbitfoot Clover
Antennaria racemosa Hook.	raceme pussytoes
Astragalus terminalis S. Watson	Railhead Milkvetch
Gentiana calycosa Griseb.	Rainier pleated gentian
Viola trinervata (Howell) Howell ex A. Gray	Rainier violet
Scheuchzeria palustris L.	rannoch-rush
Brassica napus L.	rape
Heterocodon rariflorum Nutt.	rareflower heterocodon
Phacelia rattanii A. Gray	Rattan's phacelia
Bromus briziformis Fisch. & C.A. Mey.	rattlesnake brome
Botrychium virginianum (L.) Sw.	Rattlesnake Fern
Pyrrocoma radiata Nutt.	Ray Goldenweed
Erigeron aphanactis (A. Gray) Greene	Rayless Shaggy Fleabane
Carex raynoldsii Dewey	Raynolds' sedge
Alnus rubra Bong.	Red Alder
Actaea rubra (Aiton) Willd.	Red Baneberry
Besseya rubra (Douglas ex Hook.) Rydb.	red besseya
Trifolium pratense L.	Red Clover
Sambucus racemosa L.	Red Elderberry
Festuca rubra L.	Red Fescue
Oxybasis rubra (L.) S.Fuentes, Uotila & Borsch	Red Goosefoot
Galeopsis ladanum L.	Red Hempnettle
Spergularia rubra (L.) J. Presl & C. Presl	Red Sandspurry
Salicornia rubra A. Nelson	red swampfire
Cornus sericea L.	Red-Osier Dogwood
Eremocarya micrantha (Torr.) Greene	Red-Root Alley Cat's-Eye
Ribes sanguineum Pursh	redflower currant
Amaranthus retroflexus L.	redroot amaranth
Cyperus erythrorhizos Muhl.	redroot flatsedge
Ceanothus sanguineus Pursh	redstem ceanothus
Claytonia rubra (Howell) Tidestr.	redstem springbeauty
Erodium cicutarium (L.) L'Hér. ex Aiton	Redstem Stork's Bill	✓
Agrostis gigantea Roth	Redtop
Polanisia dodecandra (L.) DC.	redwhisker clammyweed
Plantago eriopoda Torr.	redwool plantain
Phalaris arundinacea L.	Reed Canary Grass
Juncus regelii Buchenau	Regel's rush
Betula glandulosa Michx.	Resin Birch
Potamogeton epihydrus Raf.	ribbonleaf pondweed
Leersia oryzoides (L.) Sw.	rice cutgrass
Geranium richardsonii Fisch. & Trautv.	Richardson's geranium
Achnatherum richardsonii (Link) Barkworth	Richardson's needlegrass
Potamogeton richardsonii (Benn.) Rydb.	Richardson's pondweed
Penstemon triphyllus Douglas ex Lindl.	Riggin's Penstemon
Bromus diandrus Roth	ripgut brome
Bolboschoenus fluviatilis (Torr.) Soják	River Bulrush
Crataegus rivularis Nutt.	River Hawthorn
Carex stenoptila F.J. Herm.	Riverbank Sedge
Astragalus robbinsii (Oakes) A. Gray	Robbins' milkvetch
Potamogeton robbinsii Oakes	Robbins' Pondweed
Eriogonum sphaerocephalum Douglas ex Benth.	rock buckwheat
Clematis columbiana (Nutt.) Torr. & A. Gray	rock clematis
Petradoria pumila (Nutt.) Greene	Rock Goldenrod
Lupinus saxosus Howell	rock lupine
Melica stricta Bol.	Rock Melicgrass
Allium macrum S. Watson	rock onion
Carex saxatilis L.	rock sedge
Viola lithion N.H. Holmgren & P.K. Holmgren	Rock Violet
Epilobium obcordatum A. Gray	Rockfringe
Cymopterus petraeus M.E.Jones	Rockloving Wavewing
Erigeron leiomerus A. Gray	Rockslide Yellow Fleabane
Holodiscus dumosus (Nutt. ex Hook.) A. Heller	Rockspirea
Penstemon ellipticus J.M. Coult. & Fisher	rocky ledge penstemon
Ionactis stenomeres (A. Gray) Greene	Rocky Mountain aster
Cleomella serrulata (Pursh) Roalson & J.C.Hall	Rocky Mountain Beeplant
Stellaria obtusa Engelm.	Rocky Mountain chickweed
Douglasia montana A. Gray	Rocky Mountain dwarf-primrose
Festuca saximontana Rydb.	Rocky Mountain fescue
Gentianopsis thermalis (Kuntze) Iltis	Rocky Mountain Fringed Gentian
Solidago multiradiata Aiton	Rocky Mountain goldenrod
Packera streptanthifolia (Greene) W.A. Weber & Á. Löve	Rocky Mountain Groundsel
Iris missouriensis Nutt.	Rocky Mountain Iris
Juniperus scopulorum Sarg.	Rocky Mountain Juniper
Acer glabrum Torr.	Rocky Mountain Maple
Antennaria media Greene	Rocky Mountain pussytoes
Juncus saximontanus A. Nelson	Rocky Mountain rush
Epilobium saximontanum Hausskn.	Rocky Mountain willowherb
Woodsia scopulina D.C. Eaton	Rocky Mountain woodsia
Heterotheca fulcrata (Greene) Shinners	rockyscree false goldenaster
Trichophorum pumilum (Vahl) Schinz & Thell.	Rolland's Bulrush
Angelica roseana L.F. Hend.	rose angelica
Spiraea splendens Baumann ex K. Koch	rose meadowsweet
Spiraea douglasii Hook.	rose spirea
Lomatium roseanum Cronquist	Rose-Flowered Desert-parsley
Geum rossii (R. Br.) Ser.	Ross' Avens
Carex rossii Boott	Ross' sedge
Gilia sinuata Douglas ex Benth.	Rosy Gilia
Antennaria rosea Greene	rosy pussytoes
Echinochloa muricata (P. Beauv.) Fernald	rough barnyardgrass
Campanula scabrella Engelm.	Rough Bellflower
Agrostis scabra Willd.	Rough Bentgrass
Poa trivialis L.	Rough Bluegrass
Bromus squarrosus L.	Rough Brome
Lycopus asper Greene	Rough Bugleweed
Xanthium strumarium L.	rough cocklebur
Blepharipappus scaber Hook.	rough eyelashweed
Amaranthus tuberculatus (Moq.) Sauer	Roughfruit Amaranth
Prosartes trachycarpa S. Watson	roughfruit fairybells
Oreocarya flavoculata A.Nelson	Roughseed Cryptantha
Oreocarya humilis (A.Gray) Greene	Round-Spike Perennial Cat's-Eye
Rorippa sphaerocarpa (A. Gray) Britton	roundfruit yellowcress
Heuchera cylindrica Douglas ex Hook.	roundleaf alumroot
Symphoricarpos rotundifolius A. Gray	roundleaf snowberry
Drosera rotundifolia L.	roundleaf sundew
Penstemon speciosus Douglas ex Lindl.	Royal Penstemon
Ericameria nauseosa (Pall. ex Pursh) G.L. Nesom & Baird	rubber rabbitbrush
Antennaria luzuloides Torr. & A. Gray	Rush Pussytoes
Lygodesmia juncea (Pursh) D. Don ex Hook.	rush skeletonplant
Shepherdia canadensis (L.) Nutt.	Russet Buffaloberry
Elaeagnus angustifolia L.	Russian Olive
Psathyrostachys juncea (Fisch.) Nevski	Russian wildrye
Lupinus pusillus Pursh	rusty lupine
Menziesia ferruginea Sm.	rusty menziesia
Arnica rydbergii Greene	Rydberg's arnica
Erigeron rydbergii Cronquist	Rydberg's Fleabane
Penstemon rydbergii A. Nelson	Rydberg's Penstemon
Bromus secalinus L.	rye brome
Carthamus tinctorius L.	safflower
Ranunculus glaberrimus Hook.	sagebrush buttercup
Nothocalais troximoides (A. Gray) Greene	sagebrush false dandelion
Calochortus macrocarpus Douglas	sagebrush mariposa lily
Phlox aculeata A. Nelson	sagebrush phlox
Viola vallicola A. Nelson	sagebrush violet
Salix candida Flueggé ex Willd.	sageleaf willow
Stuckenia pectinata (L.) Börner	Sago Pondweed
Onobrychis viciifolia Scop.	sainfoin
Atriplex dioica Raf.	Saline Saltbush
Leymus salina (M.E. Jones) Á. Löve	Saline Wildrye
Penstemon pumilus Nutt.	Salmon River Beardtongue
Lomatium salmoniflorum (J.M. Coult. & Rose) Mathias & Constance	Salmonflower Biscuitroot
Tragopogon porrifolius L.	salsify
Heliotropium curassavicum L.	salt heliotrope
Carex hassei L.H. Bailey	Salt Sedge
Sidalcea neomexicana A. Gray	salt spring checkerbloom
Distichlis spicata (L.) Greene	Saltgrass
Halogeton glomeratus (M. Bieb.) C.A. Mey.	saltlover
Eriogonum salicornioides Gandog.	Saltwort Buckwheat
Parnassia cirrata Piper	San Bernardino Grass Of Parnassus
Cardamine parviflora L.	sand bittercress
Sporobolus cryptandrus (Torr.) A. Gray	sand dropseed
Thysanocarpus curvipes Hook.	sand fringepod
Aliciella leptomeria (A. Gray) J.M. Porter	sand gilia
Claytonia arenicola L.F. Hend.	sand springbeauty
Poa secunda J. Presl	Sandberg Bluegrass
Cryptantha fendleri (A. Gray) Greene	sanddune cryptantha
Erysimum capitatum (Douglas ex Hook.) Greene	Sanddune Wallflower
Amelanchier alnifolia (Nutt.) Nutt. ex M. Roem.	Saskatoon serviceberry
Penstemon glaber Pursh	Sawsepal Penstemon
Erigeron bloomeri A. Gray	Scabland Fleabane
Penstemon deustus Douglas ex Lindl.	Scabland Penstemon
Artemisia rigida (Nutt.) A. Gray	scabland sagebrush
Cuscuta gronovii Willd. ex Schult.	Scaldweed
Botrychium crenulatum W.H. Wagner	scalloped moonwort
Ipomopsis aggregata (Pursh) V.E. Grant	scarlet gilia
Sphaeralcea coccinea (Nutt.) Rydb.	scarlet globemallow
Antennaria aromatica Evert	scented pussytoes
Cytisus scoparius (L.) Link	Scotch broom
Onopordum acanthium L.	Scotch cottonthistle
Hypericum scouleri Hook.	Scouler's St. Johnswort
Salix scouleriana Barratt ex Hook.	Scouler's willow
Hieracium scouleri Hook.	Scouler's Woollyweed
Equisetum hyemale L.	scouringrush horsetail
Corydalis aurea Willd.	scrambled eggs
Muhlenbergia asperifolia (Nees & Meyen ex Trin.) Parodi	Scratchgrass
Lysimachia maritima (L.) Galasso, Banfi & Soldano	Sea Milkwort
Agrostis pallens Trin.	Seashore Bentgrass
Poa macrantha Vasey	seashore bluegrass
Hordeum marinum Huds.	seaside barley
Mimulus guttatus DC.	Seep Monkeyflower
Calochortus nuttallii Torr. & A. Gray	Sego Lily
Balsamorhiza serrata A. Nelson & J.F. Macbr.	serrate balsamroot
Atriplex confertifolia (Torr. & Frém.) S. Watson	Shadscale Saltbush
Erigeron pumilus Nutt.	shaggy fleabane
Astragalus malacus A. Gray	Shaggy Milkvetch
Ranunculus acriformis A. Gray	sharpleaf buttercup
Penstemon acuminatus Douglas ex Lindl.	Sharpleaf Penstemon
Physaria acutifolia Rydb.	sharpleaf twinpod
Valeriana acutiloba Rydb.	sharpleaf valerian
Eriogonum pyrolifolium Hook.	Shasta buckwheat
Carex straminiformis L.H. Bailey	Shasta Sedge
Potentilla ovina Macoun ex J.M. Macoun	sheep cinquefoil
Carex illota L.H. Bailey	sheep sedge
Carex sheldonii Mack.	Sheldon's Sedge
Viola sheltonii Torr.	Shelton's violet
Capsella bursa-pastoris (L.) Medik.	shepherd's purse
Stellaria nitens Nutt.	Shiny Chickweed
Cotoneaster lucidus Schltdl.	shiny cotoneaster
Spiraea lucida Douglas ex Greene	shinyleaf spirea
Eriogonum shockleyi S. Watson	Shockley's Buckwheat
Poa abbreviata R. Br.	short bluegrass
Psilocarphus brevissimus Nutt.	short woollyheads
Abdra brachycarpa (Nutt. ex Torr. & A.Gray) Greene	Short-Fruited Whitlow-Grass
Symphyotrichum frondosum (Nutt.) G.L. Nesom	short-rayed alkali aster
Alopecurus aequalis Sobol.	Shortawn Foxtail
Carex brevior (Dewey) Mack.	shortbeak sedge
Mimulus breviflorus Piper	shortflower monkeyflower
Salix brachycarpa Nutt.	Shortfruit Willow
Penstemon seorsus (A. Nelson) D.D. Keck	Shortlobe Penstemon
Erigeron lonchophyllus Hook.	Shortray Fleabane
Elatine brachysperma A. Gray	shortseed waterwort
Myriophyllum sibiricum Kom.	shortspike watermilfoil
Tetradymia spinosa Hook. & Arn.	Shortspine Horsebrush
Cerastium brachypodum (Engelm. ex A. Gray) B.L. Rob.	shortstalk chickweed
Eriogonum brevicaule Nutt.	Shortstem Buckwheat
Lupinus brevicaulis S. Watson	shortstem lupine
Allium brevistylum S. Watson	Shortstyle Onion
Piptatheropsis shoshoneana (Curto & Douglass M. Hend.) Romasch., P.M. Peterson & R.J. Soreng	Shoshone Ricegrass
Gypsophila elegans M. Bieb.	showy baby's-breath
Heliomeris multiflora Nutt.	showy goldeneye
Asclepias speciosa Torr.	showy milkweed
Phlox speciosa Pursh	showy phlox
Antennaria pulcherrima (Hook.) Greene	showy pussytoes
Carex spectabilis Dewey	showy sedge
Hackelia hispida (A. Gray) I.M. Johnst.	showy stickseed
Townsendia florifer (Hook.) A. Gray	showy Townsend daisy
Galium multiflorum Kellogg	shrubby bedstraw
Dasiphora fruticosa (L.) Rydb.	Shrubby Cinquefoil
Epilobium suffruticosum Nutt.	shrubby willowherb
Gilia inconspicua (Sm.) Sweet	shy gilia
Erysimum inconspicuum (S. Watson) MacMill.	Shy Wallflower
Ulmus pumila L.	Siberian Elm
Caragana arborescens Lam.	Siberian Peashrub
Claytonia sibirica L.	Siberian springbeauty
Agropyron fragile (Roth) P. Candargy	Siberian Wheatgrass
Atriplex falcata (M.E. Jones) Standl.	sickle saltbush
Boechera sparsiflora (Nutt.) Dorn	Sicklepod Rockcress
Pedicularis racemosa Douglas ex Benth.	Sickletop Lousewort
Orthilia secunda (L.) House	sidebells wintergreen
Corydalis caseana A. Gray	Sierra fumewort
Carex leporinella Mack.	Sierra hare sedge
Lathyrus nevadensis S. Watson	Sierra pea
Juncus nevadensis S. Watson	Sierra Rush
Dodecatheon jeffreyi Van Houtte	Sierra shootingstar
Descurainia californica (A. Gray) O.E. Schulz	Sierra tansymustard
Lupinus sericeus Pursh	silky lupine
Phacelia sericea (Graham) A. Gray	silky phacelia
Shepherdia argentea (Pursh) Nutt.	Silver Buffaloberry
Draba argyrea Rydb.	Silver Draba
Acer saccharinum L.	Silver Maple	✓
Artemisia cana Pursh	silver sagebrush
Elaeagnus commutata Bernh. ex Rydb.	silverberry
Astragalus argophyllus Nutt.	Silverleaf Milkvetch
Phacelia hastata Douglas ex Lehm.	Silverleaf Phacelia
Atriplex argentea Nutt.	silverscale saltbush
Polygonum argyrocoleon Steud. ex Kunze	silversheath knotweed
Argentina anserina (L.) Rydb.	Silverweed Cinquefoil
Lupinus argenteus Pursh	Silvery Lupine
Primula incana M.E. Jones	silvery primrose
Carex canescens L.	silvery sedge
Allium simillimum L.F. Hend.	Simil Onion
Carex simpliciuscula Wahlenb.	Simple Bog Sedge
Silene scouleri Hook.	Simple Campion
Moneses uniflora (L.) A. Gray	Single Delight
Ericameria suffruticosa (Nutt.) G.L. Nesom	Singlehead Goldenbush
Pinus monophylla Torr. & Frém.	Singleleaf Pinyon
Valeriana sitchensis Bong.	Sitka valerian
Salix sitchensis Sanson ex Bong.	Sitka willow
Vulpia octoflora (Walter) Rydb.	sixweeks fescue
Eragrostis lutescens Scribn.	sixweeks lovegrass
Ambrosia tomentosa Nutt.	Skeletonleaf Bur Ragweed
Veronica scutellata L.	Skullcap Speedwell
Rhus trilobata Nutt.	Skunkbush Sumac
Potentilla shockleyi (S.Watson) Jeps.	Sky Mousetail
Pectocarya penicillata (Hook. & Arn.) A. DC.	sleeping combseed
Silene antirrhina L.	sleepy silene
Platanthera stricta Lindl.	slender bog orchid
Eriogonum microthecum Nutt.	Slender Buckwheat
Schoenoplectus heterochaetus (Chase) Soják	slender bulrush
Potentilla gracilis Douglas ex Hook.	slender cinquefoil
Eriophorum gracile W.D.J. Koch	slender cottongrass
Draba albertina Greene	Slender Draba
Cyperus bipartitus Torr.	slender flatsedge
Erigeron tener (A. Gray) A. Gray	Slender Fleabane
Thermopsis gracilis Howell	slender goldenbanner
Deschampsia elongata (Hook.) Munro	Slender Hairgrass
Crepis atribarba A. Heller	slender hawksbeard
Alopecurus myosuroides Huds.	Slender Meadow Foxtail
Eremogone capillaris (Poir.) Fenzl	Slender Mountain Sandwort
Microsteris gracilis (Hook.) Greene	slender phlox
Arabis pycnocarpa M.Hopkins	Slender Rock Cress
Elymus trachycaulus (Link) Gould ex Shinners	Slender Wheatgrass
Streptanthus major (M.E.Jones) Jeps.	Slender Wild Cabbage
Lithophragma tenellum Nutt.	Slender Woodland-Star
Piperia unalascensis (Spreng.) Rydb.	slender-spire orchid
Carex athrostachya Olney	Slenderbeak Sedge
Epilobium leptocarpum Hausskn.	slenderfruit willowherb
Ipomopsis tenuituba (Rydb.) V.E. Grant	Slendertube Skyrocket
Lomatium laevigatum (Nutt.) J.M. Coult. & Rose	Slickrock Biscuitroot
Amaranthus hybridus L.	Slim Amaranth
Delphinium depauperatum Nutt.	slim larkspur
Bidens tenuisecta A. Gray	slimlobe beggarticks
Calamagrostis stricta (Timm) Koeler	slimstem reedgrass
Senecio lugens Richardson	small blacktip ragwort
Mertensia longiflora Greene	small bluebells
Anchusa arvensis (L.) M. Bieb.	small bugloss
Sparganium natans L.	small bur-reed
Camassia quamash (Pursh) Greene	small camas
Circaea alpina L.	Small Enchanter's Nightshade
Vulpia microstachys (Nutt.) Munro	small fescue
Glyceria borealis (Nash) Batchelder	small floating mannagrass
Geranium pusillum L.	Small Geranium
Allium parvum Kellogg	Small Onion
Phacelia minutissima L.F. Hend.	Small Phacelia
Potamogeton pusillus L.	small pondweed
Madia exigua (Sm.) A. Gray	small tarweed
Sisymbrium loeselii L.	small tumbleweed mustard
Viola macloskeyi Lloyd	small white violet
Stephanomeria exigua Nutt.	Small Wirelettuce
Angelica pinnata S. Watson	Small-Leaf Angelica
Antennaria parvifolia Nutt.	small-leaf pussytoes
Festuca minutiflora Rydb.	Smallflower Fescue
Gymnosteris parvula A. Heller	Smallflower Gymnosteris
Mitella stauropetala Piper	smallflower miterwort
Nemophila parviflora Douglas ex Benth.	smallflower nemophila
Tamarix parviflora DC.	smallflower tamarisk
Lithophragma parviflorum (Hook.) Nutt. ex Torr. & A. Gray	smallflower woodland-star
Anemone parviflora Michx.	smallflowered anemone
Luzula parviflora (Ehrh.) Desv.	Smallflowered Woodrush
Arnica gracilis Rydb.	smallhead arnica
Trifolium microcephalum Pursh	smallhead clover
Carex microptera Mack.	smallwing sedge
Melica smithii (Porter ex A. Gray) Vasey	Smith's melicgrass
Symphyotrichum laeve (L.) Á. Löve & D. Löve	Smooth Blue Aster
Bromus inermis Leyss.	smooth brome
Pellaea glabella Mett. ex Kuhn	smooth cliffbrake
Digitaria ischaemum (Schreb.) Schreb. ex Muhl.	smooth crabgrass
Malacothrix glabrata (A. Gray ex D.C. Eaton) A. Gray	smooth desertdandelion
Equisetum laevigatum A. Braun	smooth horsetail
Delphinium glaucescens Rydb.	Smooth Larkspur
Penstemon subglaber Rydb.	Smooth Penstemon
Linanthus glabrum (R. Patt. & Yoder-Will.) J.M. Porter & L.A. Johnson	Smooth Prickly Phlox
Atriplex pusilla (Torr. ex S. Watson) S. Watson	Smooth Saltbush
Rhus glabra L.	Smooth Sumac
Crassula solieri (Gay) F. Meigen	Smooth-Seed Pygmyweed
Mentzelia laevicaulis (Hook.) Torr. & A. Gray	Smoothstem Blazingstar
Carex laeviculmis Meinsh.	smoothstem sedge
Astragalus vallaris M.E. Jones	Snake Canyon Milkvetch
Phlox colubrina Wherry & Constance	Snake River phlox
Physaria integrifolia (Rollins) Lichvar	Snake River Twinpod
Elymus wawawaiensis J. Carlson & Barkworth	Snake River wheatgrass
Eriogonum niveum Douglas ex Benth.	snow buckwheat
Ribes niveum Lindl.	snow currant
Salix nivalis Hook.	snow willow
Cerastium tomentosum L.	Snow-In-Summer
Pediocactus nigrispinus (Hochstätter) Hochstätter	snowball cactus
Draba crassifolia Graham	snowbed draba
Ceanothus velutinus Douglas ex Hook.	Snowbrush Ceanothus
Cymopterus nivalis S. Watson	Snowline Springparsley
Pyrola minor L.	snowline wintergreen
Mentzelia mollis M. Peck	Soft Blazingstar
Bromus hordeaceus L.	Soft Brome
Carex disperma Dewey	Softleaf Sedge
Schoenoplectus tabernaemontani (C.C. Gmel.) Palla	softstem bulrush
Astragalus solitarius M. Peck	Solitary Milkvetch
Sorghum bicolor (L.) Moench	Sorghum
Prunus cerasus L.	sour cherry
Allium aaseae Ownbey	South Idaho Onion
Echinops ritro L.	southern globethistle
Najas guadalupensis (Spreng.) Magnus	southern waternymph
Artemisia abrotanum L.	southernwood
Elatine rubella Rydb.	southwestern waterwort
Malacothrix sonchoides (Nutt.) Torr. & A. Gray	sowthistle desertdandelion
Silene spaldingii S. Watson	Spalding's silene
Potentilla brevifolia Nutt. ex Torr. & A. Gray	Sparseleaf Cinquefoil
Chlorocrambe hastata (S. Watson) Rydb.	Spearhead
Agoseris retrorsa (Benth.) Greene	Spearleaf Agoseris
Arnica longifolia D.C. Eaton	spearleaf arnica
Sedum lanceolatum Torr.	spearleaf stonecrop
Mentha spicata L.	Spearmint
Nothocalais nigrescens (L.F. Hend.) A. Heller	speckled false dandelion
Agrostis exarata Trin.	spike bentgrass
Festuca kingii (S.Watson) Cassidy	Spike Fescue
Carex nardina Fr.	spike sedge
Trisetum spicatum (L.) K. Richt.	Spike Trisetum
Ipomopsis spicata (Nutt.) V.E. Grant	Spiked Ipomopsis
Delphinium stachydeum (A. Gray) Tidestr.	Spiked Larkspur
Luzula spicata (L.) DC.	spiked woodrush
Tetradymia canescens DC.	spineless horsebrush
Dryopteris carthusiana (Vill.) H.P. Fuchs	spinulose woodfern
Xanthium spinosum L.	spiny cocklebur
Glossopetalon spinescens A. Gray	spiny greasebush
Grayia spinosa (Hook.) Moq.	spiny hopsage
Astragalus kentrophyta A. Gray	Spiny Milkvetch
Phlox hoodii Richardson	spiny phlox
Carduus acanthoides L.	spiny plumeless thistle
Sonchus asper (L.) Hill	spiny sowthistle
Isoetes tenella Léman ex Desv.	Spiny-Spore Quillwort
Ruppia cirrhosa (Petagna) Grande	spiral ditchgrass
Carex tumulicola Mack.	splitawn sedge
Packera dimorphophylla (Greene) W.A. Weber & Á. Löve	Splitleaf Groundsel
Castilleja rhexiifolia Rydb.	splitleaf Indian paintbrush
Eriogonum maculatum A. Heller	spotted buckwheat
Corallorhiza maculata (Raf.) Raf.	Spotted Coralroot
Fritillaria atropurpurea Nutt.	spotted fritillary
Eutrochium maculatum (L.) E.E. Lamont	Spotted Joe Pye Weed	✓
Centaurea stoebe L.	spotted knapweed
Euphorbia maculata (L.) Small	Spotted Spurge
Hackelia patens (Nutt.) I.M. Johnst.	Spotted Stickseed
Cicuta maculata L.	Spotted Water Hemlock
Apocynum androsaemifolium L.	Spreading Dogbane
Erigeron divergens Torr. & A. Gray	spreading fleabane
Gayophytum diffusum Torr. & A. Gray	Spreading Groundsmoke
Torilis arvensis (Huds.) Link	spreading hedgeparsley
Phlox diffusa Benth.	spreading phlox
Erysimum repandum L.	spreading wallflower
Elymus scribneri (Vasey) M.E. Jones	spreading wheatgrass
Rorippa sinuata (Nutt.) Hitchc.	spreading yellowcress
Boechera divaricarpa (A.Nelson) Á.Löve & D.Löve	Spreadingpod Rockcress
Corallorhiza wisteriana Conrad	spring coralroot
Draba verna L.	spring draba
Myosotis verna Nutt.	spring forget-me-not
Milium vernale M. Bieb.	Spring Milletgrass
Eriogonum spergulinum A. Gray	spurry buckwheat
Centaurea virgata Lam.	squarrose knapweed
Elymus elymoides (Raf.) Swezey	Squirreltail
Oenothera psammophila (A.Nelson & J.F.Macbr.) W.L.Wagner, Stockh. & W.M.Klein	St. Anthony Dunes Evening Primrose
Ranunculus bulbosus L.	St. Anthony's turnip
Collomia tinctoria Kellogg	staining collomia
Plagiobothrys stipitatus (Greene) I.M. Johnst.	stalked popcornflower
Lemna trisulca L.	Star Duckweed
Carex echinata Murray	Star Sedge
Maianthemum stellatum (L.) Link	Starry False Lily of the Valley
Lupinus caespitosus Nutt.	Stemless Dwarf Lupine
Tetraneuris acaulis (Pursh) Greene	stemless four-nerve daisy
Stenotus acaulis (Nutt.) Nutt.	Stemless Mock Goldenweed
Townsendia exscapa (Richardson) Porter	stemless Townsend daisy
Ribes viscosissimum Pursh	sticky currant
Castilleja viscidula A. Gray	Sticky Indian Paintbrush
Arnica ovata Greene	Sticky Leaf Arnica
Cerastium glomeratum Thuill.	Sticky Mouse-Ear Chickweed
Phacelia glandulifera Piper	sticky phacelia
Phlox viscida E.E. Nelson	sticky phlox
Polemonium viscosum Nutt.	Sticky Polemonium
Geranium viscosissimum Fisch. & C.A. Mey. ex C.A. Mey.	sticky purple geranium
Penstemon glandulosus Douglas	Stickystem Penstemon
Galium aparine L.	stickywilly
Lathyrus rigidus T.G. White	Stiff Pea
Castilleja lutescens (Greenm.) Rydb.	stiff yellow Indian paintbrush
Penstemon aridus Rydb.	Stiffleaf Penstemon
Eragrostis cilianensis (All.) Vign. ex Janchen	stinkgrass
Anthemis cotula L.	stinking chamomile
Nemacladus rigidus Curran	Stoutstem Threadplant
Ranunculus orthorhynchus Hook.	straightbeak buttercup
Juncus orthophyllus Coville	straightleaf rush
Cyperus strigosus L.	Straw-Colored Flatsedge	✓
Trifolium fragiferum L.	strawberry clover
Epipactis gigantea Douglas ex Hook.	stream orchid

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