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2238 Plants Found

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Ordered by scientific name.

Scientific Name	Common Name	†	Map‡
Paspalum setaceum Michx.	thin paspalum
Pastinaca sativa L.	Wild Parsnip
Paxistima myrsinites (Pursh) Raf.	Oregon boxleaf
Pectis angustifolia Torr.	lemonscent
Pedicularis bracteosa Benth.	bracted lousewort
Pedicularis contorta Benth.	coiled lousewort
Pedicularis groenlandica Retz.	Elephanthead Lousewort
Pedicularis lanceolata Michx.	Swamp Lousewort
Pedicularis parryi A. Gray	Parry's Lousewort
Pedicularis racemosa Douglas ex Benth.	Sickletop Lousewort
Pediomelum argophyllum (Pursh) J. Grimes	silverleaf Indian breadroot
Pediomelum cuspidatum (Pursh) Rydb.	largebract Indian breadroot
Pediomelum digitatum (Nutt. ex Torr. & A. Gray) Isely	palmleaf Indian breadroot
Pediomelum esculentum (Pursh) Rydb.	large Indian breadroot
Pediomelum hypogaeum (Nutt. ex Torr. & A. Gray) Rydb.	subterranean Indian breadroot
Pediomelum linearifolium (Torr. & A. Gray) J. Grimes	Narrowleaf Indian Breadroot
Pediomelum tenuiflorum (Pursh) A.N.Egan	Slimflower Scurfpea
Peganum harmala L.	harmal peganum
Pellaea breweri D.C. Eaton	Brewer's cliffbrake
Pellaea glabella Mett. ex Kuhn	smooth cliffbrake
Penstemon albertinus Greene	Alberta beardtongue
Penstemon albidus Nutt.	white penstemon
Penstemon angustifolius Nutt. ex Pursh	Broadbeard Beardtongue
Penstemon attenuatus Douglas ex Lindl.	Sulphur Penstemon
Penstemon bradburyi Pursh	Large-flowered Beardtongue
Penstemon confertus Douglas ex Lindl.	Yellow Penstemon
Penstemon digitalis Nutt. ex Sims	Foxglove Beardtongue
Penstemon diphyllus Rydb.	Twoleaf Beardtongue
Penstemon ellipticus J.M. Coult. & Fisher	rocky ledge penstemon
Penstemon eriantherus Pursh	Fuzzytongue Penstemon
Penstemon fruticosus (Pursh) Greene	bush penstemon
Penstemon glaber Pursh	Sawsepal Penstemon
Penstemon gracilis Nutt.	Lilac Penstemon
Penstemon lyallii (A. Gray) A. Gray	Lyall's beardtongue
Penstemon montanus Greene	Cordroot Beardtongue
Penstemon nitidus Douglas ex Benth.	waxleaf penstemon
Penstemon procerus Douglas ex Graham	littleflower penstemon
Penstemon rydbergii A. Nelson	Rydberg's Penstemon
Penstemon tubaeflorus Nutt.	White Wand Beardtongue
Penstemon wilcoxii Rydb.	Wilcox's Penstemon
Penthorum sedoides L.	ditch stonecrop
Perideridia gairdneri (Hook. & Arn.) Mathias	Gardner's yampah
Persicaria amphibia (L.) Delarbre	Water Knotweed
Persicaria hydropiperoides (Michx.) Small	Swamp Smartweed
Persicaria lapathifolia (L.) Delarbre	Pale Smartweed
Persicaria punctata (Elliott) Small	Dotted Smartweed
Persicaria sagittata (L.) H.Gross	Arrowleaf Tearthumb
Petasites frigidus (L.) Fr.	arctic sweet coltsfoot
Petroselinum crispum (Mill.) Nyman ex A.W. Hill	Parsley
Phacelia franklinii (R. Br.) A. Gray	Franklin's phacelia
Phacelia hastata Douglas ex Lehm.	Silverleaf Phacelia
Phacelia heterophylla Pursh	varileaf phacelia
Phacelia leptosepala Rydb.	narrowsepal phacelia
Phacelia linearis (Pursh) Holz.	threadleaf phacelia
Phacelia lyallii (A. Gray) Rydb.	alpine phacelia
Phacelia sericea (Graham) A. Gray	silky phacelia
Phacelia thermalis Greene	Heated Phacelia
Phalaris arundinacea L.	Reed Canary Grass
Phalaris canariensis L.	Annual Canarygrass
Phegopteris connectilis (Michx.) Watt	long beechfern
Phemeranthus calycinus (Engelm.) Kiger	Largeflower Fameflower
Phemeranthus parviflorus (Nutt.) Kiger	sunbright
Phemeranthus rugospermus (Holz.) Kiger	Prairie Fameflower
Philadelphus lewisii Pursh	Lewis' mock orange
Phleum alpinum L.	Alpine Timothy
Phleum pratense L.	Timothy
Phlox albomarginata M.E. Jones	Whitemargin Phlox
Phlox alyssifolia Greene	alyssumleaf phlox
Phlox andicola E.E. Nelson	prairie phlox
Phlox hoodii Richardson	spiny phlox
Phlox kelseyi Britton	Kelsey's Phlox
Phlox longifolia Nutt.	longleaf phlox
Phlox missoulensis Wherry	Missoula Phlox
Phlox pulvinata (Wherry) Cronquist	Cushion Phlox
Phlox speciosa Pursh	showy phlox
Phoradendron leucarpum (Raf.) Reveal & M.C. Johnst.	Oak Mistletoe
Phragmites americanus (Saltonst., P.M.Peterson & Soreng) A.Haines	American Common Reed
Phragmites australis (Cav.) Trin. ex Steud.	Eurasian Common Reed
Phryma leptostachya L.	American lopseed
Phyla cuneifolia (Torr.) Greene	wedgeleaf
Phyla lanceolata (Michx.) Greene	Lanceleaf Fogfruit
Phyllodoce empetriformis (Sm.) D. Don	pink mountainheath
Phyllodoce glanduliflora (Hook.) Coville	yellow mountainheath
Physalis heterophylla Nees	Clammy Groundcherry
Physalis longifolia Nutt.	Longleaf Groundcherry
Physalis pumila Nutt.	Dwarf Groundcherry
Physalis pumila var. hispida (Waterf.) J.R.Sullivan	Prairie Groundcherry
Physalis virginiana Mill.	Virginia groundcherry
Physaria brassicoides Rydb.	Double Twinpod
Physaria didymocarpa (Hook.) A. Gray	common twinpod
Physaria geyeri (Hook.) A. Gray	Geyer's Twinpod
Physaria ludoviciana (Nutt.) O'Kane & Al-Shehbaz	Foothill Bladderpod
Physaria saximontana Rollins	Fremont County twinpod
Physocarpus malvaceus (Greene) Kuntze	mallow ninebark
Physocarpus opulifolius	Common Ninebark
Physostegia ledinghamii (B. Boivin) Cantino	Ledingham's false dragonhead
Physostegia parviflora Nutt. ex A. Gray	Western False Dragonhead
Physostegia virginiana (L.) Benth.	obedient plant
Picea engelmannii Parry ex Engelm.	Engelmann Spruce
Picea glauca (Moench) Voss	White Spruce	✓
Picradeniopsis oppositifolia (Nutt.) Rydb. ex Britton	oppositeleaf bahia
Pilea fontana (Lunell) Rydb.	Black-fruited Clearweed
Pilea pumila (L.) A. Gray	Canadian Clearweed
Pilosella aurantiaca (L.) F.W.Schultz & Sch.Bip.	Fox-and-Cubs
Pinguicula macroceras Link	California butterwort
Pinus albicaulis Engelm.	Whitebark Pine
Pinus banksiana Lamb.	Jack Pine
Pinus contorta Douglas ex Loudon	Lodgepole Pine
Pinus flexilis James	Limber Pine
Pinus monticola Douglas ex D. Don	Western White Pine
Pinus ponderosa Lawson & C. Lawson	Ponderosa Pine
Piperia unalascensis (Spreng.) Rydb.	slender-spire orchid
Piptatheropsis exigua (Thurb.) Romasch., P.M. Peterson & R.J. Soreng	Little Ricegrass
Piptatheropsis micrantha "(Trin. & Rupr.) Romasch.	littleseed ricegrass
Plagiobothrys leptocladus (Greene) I.M. Johnst.	finebranched popcornflower
Plantago aristata Michx.	Largebracted Plantain
Plantago canescens M.F. Adams	gray pubescent plantain
Plantago eriopoda Torr.	redwool plantain
Plantago lanceolata L.	Narrowleaf Plantain
Plantago major L.	Common Plantain
Plantago patagonica Jacq.	Woolly Plantain
Plantago rugelii Decne.	Blackseed Plantain
Platanthera aquilonis Sheviak	northern green orchid
Platanthera huronensis (Nutt.) Lindl.	Huron green orchid
Platanthera obtusata (Banks ex Pursh) Lindl.	bluntleaved orchid
Platanthera orbiculata (Pursh) Lindl.	lesser roundleaved orchid
Platanthera praeclara Sheviak & Bowles	Great Plains white fringed orchid
Platanthera stricta Lindl.	slender bog orchid
Poa abbreviata R. Br.	short bluegrass
Poa alpina L.	Alpine Bluegrass
Poa annua L.	annual bluegrass
Poa arctica R. Br.	arctic bluegrass
Poa bulbosa L.	bulbous bluegrass
Poa compressa L.	Canada bluegrass
Poa fendleriana (Steud.) Vasey	muttongrass
Poa glauca Vahl	Glaucous Bluegrass
Poa laxa Haenke	Mt. Washington bluegrass
Poa leptocoma Trin.	marsh bluegrass
Poa palustris L.	Fowl Bluegrass
Poa reflexa Vasey & Scribn. ex Vasey	Nodding Bluegrass
Poa secunda J. Presl	Sandberg Bluegrass
Poa stenantha Trin.	northern bluegrass
Poa trivialis L.	Rough Bluegrass
Polanisia dodecandra (L.) DC.	redwhisker clammyweed
Polanisia jamesii (Torr. & A. Gray) Iltis	James' clammyweed
Polemonium pulcherrimum Hook.	Jacob's-ladder
Polemonium viscosum Nutt.	Sticky Polemonium
Polygala sanguinea L.	purple milkwort
Polygala senega L.	Seneca snakeroot
Polygala verticillata L.	whorled milkwort
Polygonatum biflorum (Walter) Elliott	smooth Solomon's seal
Polygonum achoreum S.F. Blake	leathery knotweed
Polygonum douglasii Greene	Douglas' knotweed
Polygonum erectum L.	Erect Knotweed
Polygonum minimum S. Watson	broadleaf knotweed
Polygonum pensylvanicum L.	Pennsylvania Smartweed
Polygonum ramosissimum Michx.	Bushy Knotweed
Polygonum tenue Michx.	pleatleaf knotweed
Polypodium hesperium Maxon	western polypody
Polypogon monspeliensis (L.) Desf.	annual rabbitsfoot grass
Polystichum andersonii Hopkins	Anderson's hollyfern
Polystichum lonchitis (L.) Roth	northern hollyfern
Populus ×jackii	Balm-of-Gilead
Populus alba L.	White Poplar
Populus angustifolia James	Narrowleaf Cottonwood
Populus balsamifera L.	Balsam Poplar
Populus deltoides W. Bartram ex Marshall	Eastern Cottonwood
Populus tremuloides Michx.	Quaking Aspen
Portulaca oleracea L.	Common Purslane
Potamogeton alpinus Balbis	alpine pondweed
Potamogeton amplifolius Tuck.	largeleaf pondweed
Potamogeton crispus L.	Curly Pondweed
Potamogeton diversifolius Raf.	waterthread pondweed
Potamogeton epihydrus Raf.	ribbonleaf pondweed
Potamogeton foliosus Raf.	Leafy Pondweed
Potamogeton friesii Rupr.	Fries' pondweed
Potamogeton gramineus L.	variableleaf pondweed
Potamogeton natans L.	floating pondweed
Potamogeton nodosus Poir.	longleaf pondweed
Potamogeton obtusifolius Mert. & W.D.J. Koch	bluntleaf pondweed
Potamogeton praelongus Wulfen	whitestem pondweed
Potamogeton pusillus L.	small pondweed
Potamogeton richardsonii (Benn.) Rydb.	Richardson's pondweed
Potamogeton zosteriformis Fernald	flatstem pondweed
Potentilla argentea L.	silver cinquefoil
Potentilla biennis Greene	biennial cinquefoil
Potentilla bipinnatifida Douglas ex Hook.	tansy cinquefoil
Potentilla concinna Richardson	elegant cinquefoil
Potentilla effusa Douglas ex Lehm.	Branched Cinquefoil
Potentilla gracilis Douglas ex Hook.	slender cinquefoil
Potentilla hippiana Lehm.	Woolly Cinquefoil
Potentilla macounii Rydb.	Macoun's Cinquefoil
Potentilla nivea L.	Snow Cinquefoil
Potentilla norvegica L.	Norwegian cinquefoil
Potentilla ovina Macoun ex J.M. Macoun	sheep cinquefoil
Potentilla pensylvanica L.	Pennsylvania cinquefoil
Potentilla plattensis Nutt.	Platte River cinquefoil
Potentilla pulcherrima Lehm.	beautiful cinquefoil
Potentilla recta L.	sulphur cinquefoil
Potentilla subjuga Rydb.	Colorado Cinquefoil
Primula incana M.E. Jones	silvery primrose
Proboscidea louisianica (Mill.) Thell.	Ram's Horn
Prosartes hookeri Torr.	drops-of-gold
Prosartes trachycarpa S. Watson	roughfruit fairybells
Prunella vulgaris L.	Common Selfheal
Prunus americana Marshall	American Plum
Prunus armeniaca L.	apricot
Prunus cerasifera Ehrh.	cherry plum
Prunus emarginata (Douglas ex Hook.) D. Dietr.	bitter cherry
Prunus fruticosa Pall.	European Dwarf Cherry
Prunus mexicana S. Watson	Mexican plum
Prunus pensylvanica L. f.	Pin Cherry
Prunus pumila L.	Sandcherry
Prunus tomentosa Thunb.	Nanking cherry
Prunus virginiana L.	Chokecherry
Psathyrostachys juncea (Fisch.) Nevski	Russian wildrye
Pseudognaphalium canescens (DC.) W.A. Weber	Wright's cudweed
Pseudognaphalium jaliscense (Greenm.) Anderb.	Jalisco rabbit-tobacco
Pseudognaphalium obtusifolium (L.) Hilliard & B.L. Burtt	Rabbit-tobacco
Pseudognaphalium stramineum (Kunth) Anderb.	Cottonbatting Plant
Pseudoroegneria spicata (Pursh) Á. Löve	Bluebunch Wheatgrass
Pseudotsuga menziesii (Mirb.) Franco	Douglas Fir
Psilocarphus brevissimus Nutt.	short woollyheads
Pteridium aquilinum (L.) Kuhn	western brackenfern
Pterospora andromedea Nutt.	woodland pinedrops
Puccinellia distans (Jacq.) Parl.	weeping alkaligrass
Puccinellia nuttalliana (Schult.) Hitchc.	Nuttall's Alkaligrass
Pulsatilla occidentalis (S. Watson) Freyn	white pasqueflower
Pulsatilla patens (L.) Mill.	eastern pasqueflower
Purshia tridentata (Pursh) DC.	Antelope Bitterbrush
Pycnanthemum virginianum (L.) T. Dur. & B.D. Jacks. ex B.L. Rob. & Fernald	Virginia mountainmint
Pyrola asarifolia Michx.	Liverleaf Wintergreen
Pyrola chlorantha Sw.	Greenflowered Wintergreen
Pyrola elliptica Nutt.	waxflower shinleaf
Pyrola minor L.	snowline wintergreen
Pyrola picta Sm.	whiteveined wintergreen
Pyrrocoma carthamoides Hook.	largeflower goldenweed
Pyrrocoma lanceolata (Hook.) Greene	lanceleaf goldenweed
Pyrrocoma uniflora (Hook.) Greene	Plantain Goldenweed
Quercus gambelii Nutt.	Gambel Oak
Quercus macrocarpa Michx.	Bur Oak	✓
Ranunculus abortivus L.	Small-Flowered Buttercup
Ranunculus acriformis A. Gray	sharpleaf buttercup
Ranunculus acris L.	tall buttercup
Ranunculus alismifolius Geyer ex Benth.	plantainleaf buttercup
Ranunculus aquatilis L.	white water crowfoot
Ranunculus cardiophyllus Hook.	heartleaf buttercup
Ranunculus cymbalaria Pursh	Alkali Buttercup
Ranunculus eschscholtzii Schltdl.	Eschscholtz's Buttercup
Ranunculus flabellaris Raf.	Yellow Water Buttercup
Ranunculus flammula L.	greater creeping spearwort
Ranunculus glaberrimus Hook.	sagebrush buttercup
Ranunculus gmelinii DC.	Gmelin's buttercup
Ranunculus hispidus Michx.	bristly buttercup
Ranunculus longirostris Godr.	Longbeak Buttercup
Ranunculus macounii Britton	Macoun's buttercup
Ranunculus pedatifidus Sm.	surefoot buttercup
Ranunculus pensylvanicus L. f.	Pennsylvania buttercup
Ranunculus pygmaeus Wahlenb.	Pygmy Buttercup
Ranunculus repens L.	creeping buttercup
Ranunculus rhomboideus Goldie	Labrador Buttercup
Ranunculus sceleratus L.	cursed buttercup
Ranunculus suksdorfii A. Gray	Suksdorf's buttercup
Ranunculus trichophyllus Chaix	threadleaf crowfoot
Ranunculus uncinatus D. Don ex G. Don	woodland buttercup
Raphanus raphanistrum L.	wild radish
Raphanus sativus L.	cultivated radish
Ratibida columnifera (Nutt.) Wooton & Standl.	Upright Prairie Coneflower
Ratibida pinnata (Vent.) Barnhart	Gray-headed Coneflower
Redfieldia flexuosa (Thurb.) Vasey	blowout grass
Reseda lutea L.	yellow mignonette
Rhamnus alnifolia L'Hér.	alderleaf buckthorn
Rhamnus davurica Pall.	Dahurian Buckthorn
Rhamnus lanceolata Pursh	lanceleaf buckthorn
Rhinanthus minor L.	little yellow rattle
Rhodiola integrifolia Raf.	ledge stonecrop
Rhododendron albiflorum Hook.	Cascade azalea
Rhododendron columbianum (Piper) Harmaja	Western Labrador Tea
Rhus aromatica Aiton	Fragrant Sumac
Rhus glabra L.	Smooth Sumac
Rhus trilobata Nutt.	Skunkbush Sumac
Rhynchospora capillacea Torr.	needle beaksedge
Rhynchospora capitellata (Michx.) Vahl	Brownish Beaksedge
Ribes americanum Mill.	American Black Currant
Ribes aureum Pursh	Golden Currant
Ribes cereum Douglas	wax currant
Ribes hudsonianum Richardson	Northern Black Currant
Ribes inerme Rydb.	whitestem gooseberry
Ribes lacustre (Pers.) Poir.	prickly currant
Ribes missouriense Nutt.	Missouri Gooseberry
Ribes oxyacanthoides L.	Canadian gooseberry
Ribes rubrum L.	cultivated currant
Ribes viscosissimum Pursh	sticky currant
Robinia pseudoacacia L.	Black Locust
Rorippa austriaca (Crantz) Besser	Austrian yellowcress
Rorippa calycina (Engelm.) Rydb.	Persistent Sepal Yellowcress
Rorippa curvipes Greene	bluntleaf yellowcress
Rorippa curvisiliqua (Hook.) Besser ex Britton	curvepod yellowcress
Rorippa palustris (L.) Besser	bog yellowcress
Rorippa sinuata (Nutt.) Hitchc.	spreading yellowcress
Rorippa tenerrima Greene	Modoc yellowcress
Rosa acicularis Lindl.	Prickly Rose
Rosa arkansana Porter	prairie rose
Rosa blanda Aiton	Smooth Rose
Rosa gymnocarpa Nutt.	dwarf rose
Rosa nutkana C. Presl	Nootka Rose
Rosa woodsii Lindl.	Woods' Rose
Rotala ramosior (L.) Koehne	lowland rotala
Rubus occidentalis L.	Black Raspberry
Rubus parviflorus Nutt.	thimbleberry
Rubus pedatus Sm.	strawberryleaf raspberry
Rubus pubescens Raf.	dwarf red blackberry
Rubus strigosus Michx.	American Red Raspberry
Rudbeckia amplexicaulis Vahl	Clasping Coneflower
Rudbeckia hirta L.	Black-eyed Susan	✓
Rudbeckia laciniata L.	Cutleaf Coneflower	✓
Rumex acetosella L.	common sheep sorrel
Rumex altissimus Alph. Wood	pale dock
Rumex crispus L.	curly dock
Rumex hymenosepalus Torr.	canaigre dock
Rumex lapponicus (Hiitonen) Czern.	dock
Rumex longifolius DC.	dooryard dock
Rumex occidentalis S. Watson	Western Dock
Rumex orbiculatus A. Gray	Greater Water Dock
Rumex paucifolius Nutt.	alpine sheep sorrel
Rumex pseudonatronatus Borbás	field dock
Rumex stenophyllus Ledeb.	narrowleaf dock
Rumex venosus Pursh	Veiny Dock
Ruppia cirrhosa (Petagna) Grande	spiral ditchgrass
Sabulina austromontana (S.J.Wolf & Packer) Dillenb. & Kadereit	Columbian Stitchwort
Sabulina rubella (Wahlenb.) Dillenb. & Kadereit	Beautiful Sandwort
Sagina nivalis (Lindbl.) Fr.	Snow Pearlwort
Sagina saginoides (L.) Karst.	arctic pearlwort
Sagittaria brevirostra Mack. & Bush	shortbeak arrowhead
Sagittaria calycina Engelm.	hooded arrowhead
Sagittaria cuneata Sheldon	arumleaf arrowhead
Sagittaria graminea Michx.	Grassy Arrowhead
Sagittaria latifolia Willd.	Broadleaf Arrowhead
Sagittaria rigida Pursh	sessilefruit arrowhead
Salicornia rubra A. Nelson	red swampfire
Salix alba L.	White Willow
Salix amygdaloides Andersson	peachleaf willow
Salix barclayi Andersson	Barclay's Willow
Salix barrattiana Hook.	Barratt's Willow
Salix bebbiana Sarg.	Bebb Willow
Salix boothii Dorn	Booth's willow
Salix brachycarpa Nutt.	Shortfruit Willow
Salix candida Flueggé ex Willd.	sageleaf willow
Salix commutata Bebb	undergreen willow
Salix discolor Muhl.	American Pussy Willow
Salix drummondiana Barratt ex Hook.	Drummond's willow
Salix eriocephala Michx.	Missouri River Willow
Salix exigua Nutt.	narrowleaf willow
Salix farriae C.R. Ball	Farr's willow
Salix geyeriana Andersson	Geyer willow
Salix glauca L.	grayleaf willow
Salix humilis Marshall	Prairie Willow
Salix interior Rowlee	Sandbar Willow
Salix lemmonii Bebb	Lemmon's Willow
Salix lucida Muhl.	Shining Willow
Salix lutea Nutt.	yellow willow
Salix melanopsis Nutt.	dusky willow
Salix nivalis Hook.	snow willow
Salix pentandra L.	Laurel Willow
Salix petiolaris Sm.	meadow willow
Salix petrophila Rydb.	alpine willow
Salix planifolia Pursh	Diamondleaf Willow
Salix prolixa Andersson	MacKenzie's willow
Salix pseudomonticola C.R. Ball	false mountain willow
Salix rotundifolia Trautv.	Least Willow
Salix scouleriana Barratt ex Hook.	Scouler's willow
Salix serissima (L.H. Bailey) Fernald	autumn willow
Salix sitchensis Sanson ex Bong.	Sitka willow
Salix tweedyi (Bebb ex Rose) C.R. Ball	Tweedy's willow
Salix vestita Pursh	rock willow
Salix wolfii Bebb	Wolf's Willow
Salsola collina Pall.	slender Russian thistle
Salsola tragus L.	prickly Russian thistle
Salvia pratensis L.	introduced sage
Salvia reflexa Hornem.	Lanceleaf Sage
Sambucus racemosa L.	Red Elderberry
Sanicula canadensis L.	Canadian Blacksnakeroot
Sanicula graveolens Poepp. ex DC.	northern sanicle
Sanicula marilandica L.	Maryland Sanicle
Sanicula odorata (Raf.) K.M. Pryer & L.R. Phillippe	Clustered Blacksnakeroot
Saponaria officinalis L.	bouncingbet
Sarcobatus vermiculatus (Hook.) Torr.	Greasewood
Saussurea densa (Hook.) Rydb.	Clustered Sawwort
Saxifraga adscendens L.	wedgeleaf saxifrage
Saxifraga bronchialis L.	Yellowdot Saxifrage
Saxifraga caespitosa L.	tufted alpine saxifrage
Saxifraga mertensiana Bong.	wood saxifrage
Saxifraga oppositifolia L.	purple mountain saxifrage
Schedonnardus paniculatus (Nutt.) Trel.	tumblegrass
Schedonorus pratensis (Huds.) P. Beauv.	meadow fescue
Scheuchzeria palustris L.	rannoch-rush
Schizachne purpurascens (Torr.) Swallen	false melic
Schizachyrium scoparium (Michx.) Nash	Little Bluestem
Schoenoplectiella hallii (A.Gray) Lye	Hall's bulrush
Schoenoplectiella saximontana (Fernald) Lye	Rocky Mountain bulrush
Schoenoplectus acutus (Muhl. ex Bigelow) Á. Löve & D. Löve	Hardstem Bulrush
Schoenoplectus americanus (Pers.) Volkart ex Schinz & R. Keller	chairmaker's bulrush
Schoenoplectus heterochaetus (Chase) Soják	slender bulrush
Schoenoplectus pungens (Vahl) Palla	common threesquare
Schoenoplectus subterminalis (Torr.) Soják	swaying bulrush
Schoenoplectus tabernaemontani (C.C. Gmel.) Palla	softstem bulrush
Scirpus atrovirens Willd.	green bulrush
Scirpus microcarpus J. Presl & C. Presl	panicled bulrush
Scirpus nevadensis S. Watson	Nevada bulrush
Scirpus pallidus (Britton) Fernald	Cloaked Bulrush
Scirpus pendulus Muhl.	Rufous Bulrush
Scleranthus annuus L.	German knotgrass
Scolochloa festucacea (Willd.) Link	common rivergrass
Scorzonera laciniata L.	cutleaf vipergrass
Scrophularia lanceolata Pursh	lanceleaf figwort
Scutellaria galericulata L.	marsh skullcap
Scutellaria lateriflora L.	blue skullcap
Scutellaria parvula Michx.	Small Skullcap
Secale cereale L.	Cereal Rye
Securigera varia (L.) Lassen	crownvetch
Sedum acre L.	goldmoss stonecrop
Sedum lanceolatum Torr.	spearleaf stonecrop
Sedum stenopetalum Pursh	wormleaf stonecrop
Selaginella densa Rydb.	lesser spikemoss
Selaginella rupestris (L.) Spring	northern selaginella
Selaginella wallacei Hieron.	Wallace's spikemoss
Senecio eremophilus Richardson	desert ragwort
Senecio fremontii Torr. & A. Gray	dwarf mountain ragwort
Senecio hydrophiloides Rydb.	tall groundsel
Senecio integerrimus Nutt.	lambstongue ragwort
Senecio lugens Richardson	small blacktip ragwort
Senecio megacephalus Nutt.	rocky ragwort
Senecio riddellii Torr. & A. Gray	Riddell's ragwort
Senecio serra Hook.	tall ragwort
Senecio sphaerocephalus Greene	ballhead ragwort
Senecio triangularis Hook.	arrowleaf ragwort
Senecio vulgaris L.	Common Groundsel
Setaria pumila (Poir.) Roem. & Schult.	yellow foxtail
Setaria verticillata (L.) P. Beauv.	hooked bristlegrass
Setaria viridis (L.) P. Beauv.	green bristlegrass
Shepherdia argentea (Pursh) Nutt.	Silver Buffaloberry
Shepherdia canadensis (L.) Nutt.	Russet Buffaloberry
Shinnersoseris rostrata (A. Gray) S. Tomb	beaked skeletonweed
Sicyos angulatus L.	Oneseed Bur Cucumber
Silene acaulis (L.) Jacq.	moss campion
Silene antirrhina L.	sleepy silene
Silene conoidea L.	weed silene
Silene csereii Baumg.	Balkan catchfly
Silene dichotoma Ehrh.	forked catchfly
Silene drummondii Hook.	Drummond's campion
Silene latifolia Poir.	bladder campion
Silene menziesii Hook.	Menzies' campion
Silene noctiflora L.	nightflowering silene
Silene parryi (S. Watson) C.L. Hitchc. & Maguire	Parry's silene
Silene scouleri Hook.	Simple Campion
Silene stellata (L.) W.T. Aiton	widowsfrill
Silene uralensis (Rupr.) Bocquet	Apetalous Catchfly
Silene vulgaris (Moench) Garcke	maidenstears
Silphium integrifolium Michx.	wholeleaf rosinweed
Silphium laciniatum L.	compassplant
Silphium perfoliatum L.	Cup Plant
Sinapis alba L.	white mustard
Sinapis arvensis L.	charlock mustard
Sisymbrium altissimum L.	tall tumblemustard
Sisymbrium linifolium (Nutt.) Nutt.	Flaxleaf Plainsmustard
Sisymbrium loeselii L.	small tumbleweed mustard
Sisymbrium officinale (L.) Scop.	hedgemustard
Sisyrinchium campestre E.P. Bicknell	prairie blue-eyed grass
Sisyrinchium idahoense E.P. Bicknell	Idaho blue-eyed grass
Sisyrinchium montanum Greene	strict blue-eyed grass
Sisyrinchium mucronatum Michx.	needletip blue-eyed grass
Sisyrinchium septentrionale E.P. Bicknell	northern blue-eyed grass
Sium suave Walter	hemlock waterparsnip
Smilax tamnoides L.	Bristly Greenbrier
Solanum carolinense L.	Carolina Horsenettle
Solanum dulcamara L.	Bittersweet Nightshade
Solanum lycopersicum L.	Garden Tomato
Solanum physalifolium Rusby	hoe nightshade
Solanum ptycanthum Dunal	West Indian Nightshade
Solanum triflorum Nutt.	cutleaf nightshade
Solidago altissima L.	Tall Goldenrod
Solidago canadensis L.	Canada Goldenrod
Solidago gigantea Aiton	Giant Goldenrod
Solidago missouriensis Nutt.	Missouri goldenrod
Solidago mollis Bartlett	velvety goldenrod
Solidago multiradiata Aiton	Rocky Mountain goldenrod
Solidago nana Nutt.	Baby Goldenrod
Solidago nemoralis Aiton	gray goldenrod
Solidago ptarmicoides (Torr. & A.Gray) B.Boivin	Prairie Goldenrod
Solidago simplex Kunth	Mt. Albert goldenrod
Solidago speciosa Nutt.	showy goldenrod
Sonchus arvensis L.	field sowthistle
Sonchus asper (L.) Hill	spiny sowthistle
Sonchus oleraceus L.	common sowthistle
Sophora nuttalliana B.L. Turner	silky sophora
Sorbus scopulina Greene	Greene's mountain ash
Sorbus sitchensis M. Roem.	western mountain ash
Sorghastrum nutans (L.) Nash	Yellow Indiangrass
Sorghum bicolor (L.) Moench	Sorghum
Sorghum halepense (L.) Pers.	Johnsongrass

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