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4190 Plants Found

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Scientific Name	Common Name	†	Map‡
Sphaeralcea leptophylla (A. Gray) Rydb.	Scaly Globemallow
Oenothera suffrutescens (Moc. & Sessé ex Ser.) W.L.Wagner & Hoch	Scarlet Beeblossom
Potentilla thurberi A. Gray	scarlet cinquefoil
Pyracantha coccinea M. Roem.	scarlet firethorn
Mirabilis coccinea (Torr.) Benth. & Hook. f.	scarlet four o'clock
Ipomopsis aggregata (Pursh) V.E. Grant	scarlet gilia
Sphaeralcea coccinea (Nutt.) Rydb.	scarlet globemallow
Echinocereus coccineus Engelm.	scarlet hedgehog cactus
Stachys coccinea Ortega	scarlet hedgenettle
Mimulus cardinalis Douglas ex Benth.	scarlet monkeyflower
Boerhavia coccinea Mill.	scarlet spiderling
Croton suaveolens Torr.	scented croton
Cryptantha utahensis (A. Gray) Greene	Scented Cryptantha
Lilaeopsis schaffneriana (Schltdl.) J.M. Coult. & Rose	Schaffner's grasswort
Bulbostylis schaffneri (Boeckeler) C.B. Clarke	Schaffner's Hairsedge
Linum schiedeanum Schltdl. & Cham.	Schied's flax
Dyschoriste schiedeana (Nees) Kuntze	Schied's snakeherb
Carex muriculata F.J. Herm.	Schiede's sedge
Loeseliastrum schottii (Torr.) Timbrook	Schott's calico
Agave schottii Engelm.	Schott's century plant
Peucephyllum schottii A. Gray	Schott's pygmycedar
Nissolia schottii (Torr.) A. Gray	Schott's Yellowhood
Yucca ×schottii Engelm.	Schott's Yucca
Cyperus schweinitzii Torr.	Schweinitz's flatsedge
Onopordum acanthium L.	Scotch cottonthistle
Rosa spinosissima L.	Scotch rose
Hypericum scouleri Hook.	Scouler's St. Johnswort
Salix scouleriana Barratt ex Hook.	Scouler's willow
Equisetum hyemale L.	scouringrush horsetail
Corydalis aurea Willd.	scrambled eggs
Muhlenbergia asperifolia (Nees & Meyen ex Trin.) Parodi	Scratchgrass
Prosopis pubescens Benth.	screwbean mesquite
Muhlenbergia straminea Hitchc.	screwleaf muhly
Achnatherum scribneri (Vasey) Barkworth	Scribner needlegrass
Malvella lepidota (A. Gray) Fryxell	scurfymallow
Lysimachia maritima (L.) Galasso, Banfi & Soldano	Sea Milkwort
Dalea searlsiae (A. Gray) Barneby	Searls' Prairie Clover
Opuntia ×martiniana (L.D. Benson) Parfitt	Seashore Cactus
Hordeum marinum Huds.	seaside barley
Calibrachoa parviflora (Juss.) D'Arcy	Seaside Petunia
Leibnitzia lyrata (D. Don) G.L. Nesom	Seeman's sunbonnets
Mimulus guttatus DC.	Seep Monkeyflower
Calochortus nuttallii Torr. & A. Gray	Sego Lily
Heuchera eastwoodiae Rosend., Butters & Lakela	Senator Mine Alumroot
Astragalus cremnophylax Barneby	Sentry Milkvetch
Eriogonum gypsophilum Wooton & Standl.	Seven River Hills Buckwheat
Atriplex confertifolia (Torr. & Frém.) S. Watson	Shadscale Saltbush
Melampodium strigosum Stuessy	shaggy blackfoot
Evolvulus nuttallianus Schult.	shaggy dwarf morning-glory
Lepidium lasiocarpum Nutt.	shaggyfruit pepperweed
Bromus mucroglumis Wagnon	sharpglume brome
Astragalus acutirostris S. Watson	sharpkeel milkvetch
Physalis acutifolia (Miers) Sandw.	Sharpleaf Groundcherry
Physaria acutifolia Rydb.	sharpleaf twinpod
Valeriana acutiloba Rydb.	sharpleaf valerian
Astragalus nothoxys A. Gray	sheep milkvetch
Moluccella laevis L.	shellflower
Capsella bursa-pastoris (L.) Medik.	shepherd's purse
Mentzelia nitens Greene	shining blazingstar
Huperzia lucidula (Michx.) Trevis.	Shining Clubmoss
Stellaria nitens Nutt.	Shiny Chickweed
Petalonyx nitidus S. Watson	Shinyleaf Sandpaper Plant
Eriogonum shockleyi S. Watson	Shockley's Buckwheat
Muhlenbergia brevis C.O. Goodding	short muhly
Abdra brachycarpa (Nutt. ex Torr. & A.Gray) Greene	Short-Fruited Whitlow-Grass
Symphyotrichum frondosum (Nutt.) G.L. Nesom	short-rayed alkali aster
Astragalus shortianus Nutt.	Short's Milkvetch
Alopecurus aequalis Sobol.	Shortawn Foxtail
Carex brevior (Dewey) Mack.	shortbeak sedge
Platanthera brevifolia (Greene) Kranzlin	Shortflowered Bog Orchid
Oenothera brachycarpa A. Gray	Shortfruit Evening Primrose
Baccharis brachyphylla A. Gray	shortleaf baccharis
Jefea brevifolia (A. Gray) Strother	shortleaf jefea
Erioneuron avenaceum (Kunth) Tateoka	shortleaf woollygrass
Hirschfeldia incana (L.) Lagr.-Foss.	shortpod mustard
Erigeron lonchophyllus Hook.	Shortray Fleabane
Elatine brachysperma A. Gray	shortseed waterwort
Lewisia brachycalyx Engelm. ex A. Gray	Shortsepal Lewisia
Myriophyllum sibiricum Kom.	shortspike watermilfoil
Tetradymia spinosa Hook. & Arn.	Shortspine Horsebrush
Cerastium brachypodum (Engelm. ex A. Gray) B.L. Rob.	shortstalk chickweed
Penstemon breviculus (D.D. Keck) Nisbet & R.C. Jacks.	Shortstem Beardtongue
Lupinus brevicaulis S. Watson	shortstem lupine
Senecio amplectens A. Gray	Showy Alpine Ragwort
Draba spectabilis Greene	Showy Draba
Oenothera grandis (Britton) Smyth	showy evening primrose
Heliomeris multiflora Nutt.	showy goldeneye
Menodora longiflora A. Gray	showy menodora
Asclepias speciosa Torr.	showy milkweed
Leucosyris carnosa (A.Gray) Greene	Shrubby Alkaliaster
Brickellia frutescens A. Gray	shrubby brickellbush
Dasiphora fruticosa (L.) Rydb.	Shrubby Cinquefoil
Acalypha phleoides Cav.	shrubby copperleaf
Acmispon rigidus (Benth.) Brouillet	Shrubby Deervetch
Malvastrum bicuspidatum (S. Watson) Rose	shrubby false mallow
Tidestromia suffruticosa (Torr.) Standl.	shrubby honeysweet
Abutilon abutiloides (Jacq.) Garcke ex Hochr.	shrubby Indian mallow
Portulaca suffrutescens Engelm.	shrubby purslane
Heimia salicifolia (Kunth) Link	Shrubby Yellowcrest
Gilia inconspicua (Sm.) Sweet	shy gilia
Erysimum inconspicuum (S. Watson) MacMill.	Shy Wallflower
Ulmus pumila L.	Siberian Elm
Caragana arborescens Lam.	Siberian Peashrub
Agropyron fragile (Roth) P. Candargy	Siberian Wheatgrass
Hoffmannseggia drepanocarpa A. Gray	sicklepod holdback
Pedicularis racemosa Douglas ex Benth.	Sickletop Lousewort
Bouteloua curtipendula (Michx.) Torr.	Side-oats Grama
Penstemon secundiflorus Benth.	Sidebells Penstemon
Orthilia secunda (L.) House	sidebells wintergreen
Erigeron anchana G.L. Nesom	Sierra Ancha Fleabane
Potentilla sierrae-blancae Wooton & Rydb.	Sierra Blanca Cinquefoil
Ionactis elegans (Soreng & Spellenb.) G.L. Nesom	Sierra Blanca Least-Daisy
Juncus nevadensis S. Watson	Sierra Rush
Descurainia californica (A. Gray) O.E. Schulz	Sierra tansymustard
Castilleja lanata A. Gray	Sierra woolly Indian paintbrush
Sclerocactus sileri (L.D. Benson) K.D. Heil & J.M. Porter	Siler Fishhook Cactus
Pediocactus sileri (Engelm. ex J.M. Coult.) L.D. Benson	Siler Pincushion Cactus
Portulaca halimoides L.	silkcotton purslane
Lupinus sericeus Pursh	silky lupine
Astragalus sericoleucus A. Gray	Silky Milkvetch
Ipomoea pubescens Lam.	silky morning-glory
Phacelia sericea (Graham) A. Gray	silky phacelia
Dalea villosa (Nutt.) Spreng.	silky prairie clover
Sophora nuttalliana B.L. Turner	silky sophora
Potentilla ambigens Greene	Silkyleaf Cinquefoil
Shepherdia argentea (Pursh) Nutt.	Silver Buffaloberry
Evolvulus sericeus Sw.	silver dwarf morning-glory
Erigeron argentatus A. Gray	Silver Fleabane
Dichondra argentea Humb. & Bonpl. ex Willd.	silver ponysfoot
Dalea bicolor Humb. & Bonpl. ex Willd.	silver prairie clover
Artemisia cana Pursh	silver sagebrush
Senna artemisioides (Gaudich. ex DC.) Randell	silver senna
Astragalus subcinereus A. Gray	Silver's Milkvetch
Elaeagnus commutata Bernh. ex Rydb.	silverberry
Philadelphus argyrocalyx Wooton	silvercup mock orange
Pediomelum argophyllum (Pursh) J. Grimes	silverleaf Indian breadroot
Astragalus argophyllus Nutt.	Silverleaf Milkvetch
Quercus hypoleucoides A. Camus	silverleaf oak
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
Carex canescens L.	silvery sedge
Silene scouleri Hook.	Simple Campion
Desmodium psilophyllum Schltdl.	simpleleaf ticktrefoil
Moneses uniflora (L.) A. Gray	Single Delight
Aristida schiedeana Trin. & Rupr.	single threeawn
Fraxinus anomala Torr. ex S. Watson	Singleleaf Ash
Pinus monophylla Torr. & Frém.	Singleleaf Pinyon
Ambrosia monogyra (Torr. & A.Gray) Strother & B.G.Baldwin	Singlewhorl Burrobrush
Erigeron sivinskii G.L. Nesom	Sivinsk's Erigeron
Euphorbia hexagona Nutt. ex Spreng.	sixangle spurge
Vulpia octoflora (Walter) Rydb.	sixweeks fescue
Bouteloua barbata Lag.	sixweeks grama
Eragrostis lutescens Scribn.	sixweeks lovegrass
Muhlenbergia depauperata Scribn.	Sixweeks Muhly
Dalea polygonoides A. Gray	sixweeks prairie clover
Aristida adscensionis L.	sixweeks threeawn
Ambrosia tomentosa Nutt.	Skeletonleaf Bur Ragweed
Rhus trilobata Nutt.	Skunkbush Sumac
Phacelia coerulea Greene	Skyblue Phacelia
Pectocarya penicillata (Hook. & Arn.) A. DC.	sleeping combseed
Silene antirrhina L.	sleepy silene
Achnatherum robustum (Vasey) Barkworth	sleepygrass
Amaranthus viridis L.	slender amaranth
Eriogonum microthecum Nutt.	Slender Buckwheat
Potentilla gracilis Douglas ex Hook.	slender cinquefoil
Gnaphalium exilifolium A. Nelson	Slender Cudweed
Cyclanthera gracillima Cogn.	slender cyclanthera
Cuscuta leptantha Engelm.	slender dodder
Draba albertina Greene	Slender Draba
Evolvulus alsinoides (L.) L.	slender dwarf morning-glory
Cyperus bipartitus Torr.	slender flatsedge
Xanthisma gracile (Nutt.) D.R.Morgan & R.L.Hartm.	Slender Goldenweed
Bouteloua repens (Kunth) Scribn. & Merr.	slender grama
Thelesperma simplicifolium A. Gray	slender greenthread
Deschampsia elongata (Hook.) Munro	Slender Hairgrass
Janusia gracilis A. Gray	slender janusia
Astragalus gracilis Nutt.	slender milkvetch
Muhlenbergia tenuifolia (Kunth) Trin.	slender muhly
Avena barbata Pott ex Link	slender oat
Microsteris gracilis (Hook.) Greene	slender phlox
Porophyllum gracile Benth.	slender poreleaf
Arabis pycnocarpa M.Hopkins	Slender Rock Cress
Salsola collina Pall.	slender Russian thistle
Sesuvium maritimum (Walter) Britton, Sterns & Poggenb	Slender Seapurslane
Chamaecrista serpens (L.) Greene	Slender Sensitive Pea
Froelichia gracilis (Hook.) Moq.	Slender Snakecotton
Boerhavia triquetra S. Watson	slender spiderling
Sphenopholis intermedia (Rydb.) Rydb.	slender wedgescale
Elymus trachycaulus (Link) Gould ex Shinners	Slender Wheatgrass
Lithophragma tenellum Nutt.	Slender Woodland-Star
Oxalis dillenii Jacq.	Slender Yellow Woodsorrel
Piperia unalascensis (Spreng.) Rydb.	slender-spire orchid
Carex athrostachya Olney	Slenderbeak Sedge
Atriplex graciliflora M.E. Jones	Slenderflower Saltbush
Epilobium leptocarpum Hausskn.	slenderfruit willowherb
Eriogonum leptophyllum (Torr. & A. Gray) Wooton & Standl.	Slenderleaf Buckwheat
Agalinis tenuifolia (Vahl) Raf.	Slenderleaf False Foxglove
Mesembryanthemum nodiflorum L.	Slenderleaf Iceplant
Ipomopsis tenuituba (Rydb.) V.E. Grant	Slendertube Skyrocket
Strophostyles leiosperma (Torr. & A. Gray) Piper	Slickseed Fuzzybean
Amaranthus hybridus L.	Slim Amaranth
Tridens muticus (Torr.) Nash	slim tridens
Pediomelum tenuiflorum (Pursh) A.N.Egan	Slimflower Scurfpea
Agave gracilipes Trel.	Slimfoot Century Plant
Phaseolus filiformis Benth.	slimjim bean
Phaseolus angustissimus A. Gray	slimleaf bean
Drymaria molluginea (Lag.) Didr.	slimleaf drymary
Chenopodium pallescens Standl.	slimleaf goosefoot
Heliotropium torreyi I.M. Johnst.	slimleaf heliotrope
Dichanthelium linearifolium (Scribn. ex Nash) Gould	slimleaf panicgrass
Dalea tenuifolia (A. Gray) Shinners	Slimleaf Prairie Clover
Bidens tenuisecta A. Gray	slimlobe beggarticks
Ibervillea tenuisecta (A. Gray) Small	slimlobe globeberry
Asclepias quinquedentata A. Gray	slimpod milkweed
Boerhavia gracillima Heimerl	slimstalk spiderling
Muhlenbergia filiculmis Vasey	slimstem muhly
Calamagrostis stricta (Timm) Koeler	slimstem reedgrass
Ulmus rubra Muhl.	Slippery Elm
Tillandsia recurvata (L.) L.	small ballmoss
Sparganium natans L.	small bur-reed
Teucrium cubense Jacq.	small coastal germander
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
Pediomelum pentaphyllum (L.) Rydb.	small Indian breadroot
Guilleminea densa (Humb. & Bonpl. ex Schult.) Moq.	Small Matweed
Potamogeton pusillus L.	small pondweed
Pinaropappus parvus S.F. Blake	small rocklettuce
Sisymbrium loeselii L.	small tumbleweed mustard
Viola macloskeyi Lloyd	small white violet
Stephanomeria exigua Nutt.	Small Wirelettuce
Ranunculus abortivus L.	Small-Flowered Buttercup
Galinsoga parviflora Cav.	Small-Flowered Quickweed
Angelica pinnata S. Watson	Small-Leaf Angelica
Sicyos microphyllus Kunth	small-leaf bur cucumber
Argyrochosma microphylla (Mett. ex Kuhn) Windham	small-leaf false cloak fern
Sphaeralcea parvifolia A. Nelson	small-leaf globemallow
Antennaria parvifolia Nutt.	small-leaf pussytoes
Sicyos parviflorus Willd.	smallflower bur cucumber
Pyrrhopappus pauciflorus (D. Don) DC.	smallflower desert-chicory
Festuca minutiflora Rydb.	Smallflower Fescue
Sclerocactus parviflorus Clover & Jotter	Smallflower Fishhook Cactus
Lipocarpha micrantha (Vahl) G. Tucker	smallflower halfchaff sedge
Tripterocalyx micranthus (Torr.) Hook.	Smallflower Sandverbena
Tamarix parviflora DC.	smallflower tamarisk
Astragalus nuttallianus DC.	smallflowered milkvetch
Luzula parviflora (Ehrh.) Desv.	Smallflowered Woodrush
Trifolium microcephalum Pursh	smallhead clover
Helenium microcephalum DC.	smallhead sneezeweed
Euphorbia polycarpa Benth.	Smallseed Sandmat
Boehmeria cylindrica (L.) Sw.	Smallspike False Nettle	✓
Carex microptera Mack.	smallwing sedge
Phyllanthus polygonoides Nutt. ex Spreng.	smartweed leaf-flower
Piptatherum miliaceum (L.) Coss.	smilograss
Rhamnus smithii Greene	Smith's buckthorn
Psorothamnus spinosus (A. Gray) Barneby	smoketree
Hesperocyparis glabra (Sudw.) Bartel	Smooth Arizona Cypress
Bidens laevis	Smooth Beggartick
Symphyotrichum laeve (L.) Á. Löve & D. Löve	Smooth Blue Aster
Bromus inermis Leyss.	smooth brome
Sicyos glaber Wooton	smooth bur cucumber
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
Cyperus laevigatus L.	smooth flatsedge
Equisetum laevigatum A. Braun	smooth horsetail
Heliopsis helianthoides (L.) Sweet	Smooth Oxeye
Polygonatum biflorum (Walter) Elliott	smooth Solomon's seal
Mirabilis oxybaphoides (A. Gray) A. Gray	smooth spreading four o'clock
Rhus glabra L.	Smooth Sumac
Townsendia formosa Greene	Smooth Townsend Daisy
Lithospermum cobrense Greene	smooththroat stoneseed
Malacothrix coulteri Harv. & A. Gray	snake's head
Keckiella antirrhinoides (Benth.) Straw	snapdragon penstemon
Escobaria sneedii Britton & Rose	Sneed's pincushion cactus
Potentilla nivea L.	Snow Cinquefoil
Ribes niveum Lindl.	snow currant
Euphorbia marginata Pursh	Snow On The Mountain
Salix nivalis Hook.	snow willow
Abronia fragrans Nutt. ex Hook.	Snowball Sand Verbena
Draba crassifolia Graham	snowbed draba
Pyrola minor L.	snowline wintergreen
Yucca elata (Engelm.) Engelm.	soaptree yucca
Yucca glauca Nutt.	soapweed yucca
Bromus hordeaceus L.	Soft Brome
Enneapogon cenchroides (Licht.) Roem. & Schult. ex C.E. Hubbard	soft feather pappusgrass
Dalea mollissima (Rydb.) Munz	soft prairie clover
Carex disperma Dewey	Softleaf Sedge
Schoenoplectus tabernaemontani (C.C. Gmel.) Palla	softstem bulrush
Solanum adscendens Sendtn.	sonoita nightshade
Heterotheca marginata Semple	Sonora False Goldenaster
Phaseolus pedicellatus Benth.	Sonoran Bean
Brickellia simplex A. Gray	Sonoran brickellbush
Pectis cylindrica (Fernald) Rydb.	Sonoran chinchweed
Croton sonorae Torr.	Sonoran croton
Malacothrix sonorae W.S. Davis & P.H. Raven	Sonoran desertdandelion
Cuscuta erosa Yunck.	Sonoran Dodder
Agastache wrightii (Greenm.) Wooton & Standl.	Sonoran giant hyssop
Gomphrena sonorae Torr.	Sonoran globe amaranth
Abutilon mollicomum (Willd.) Sweet	Sonoran Indian mallow
Indigofera sphaerocarpa A. Gray	Sonoran indigo
Stylocline sonorensis Wiggins	Sonoran neststraw
Dalea filiformis A. Gray	Sonoran prairie clover
Argemone gracilenta Greene	Sonoran pricklypoppy
Quercus turbinella Greene	Sonoran scrub oak
Fleischmannia sonorae (A. Gray) R.M. King & H. Rob.	Sonoran thoroughwort
Lepidium sordidum A. Gray	sordid pepperweed
Sorghum bicolor (L.) Moench	Sorghum
Eriogonum polycladon Benth.	sorrel buckwheat
Cissus trifoliata (L.) L.	sorrelvine
Prunus cerasus L.	sour cherry
Digitaria insularis (L.) Mez ex Ekman	sourgrass
Oenothera pubescens Willd. ex Spreng.	South American evening primrose
Symphyotrichum divaricatum (Nutt.) G.L. Nesom	Southern Annual Saltmarsh Aster
Catalpa bignonioides Walter	Southern Catalpa
Typha domingensis Pers.	southern cattail
Digitaria ciliaris (Retz.) Koeler	southern crabgrass
Linum australe A. Heller	southern flax
Isocoma pluriflora (Torr. & A. Gray) Greene	southern goldenbush
Lepidium austrinum Small	southern pepperwort
Cenchrus echinatus L.	southern sandbur
Najas guadalupensis (Spreng.) Magnus	southern waternymph
Festuca calligera (Piper) Rydb.	Southwest Fescue
Symphyotrichum expansum (Poepp. ex Spreng.) G.L. Nesom	southwestern annual saltmarsh aster
Penstemon laevis Pennell	Southwestern Beardtongue
Setaria scheelei (Steud.) Hitchc.	southwestern bristlegrass
Cosmos parviflorus (Jacq.) Pers.	southwestern cosmos
Argyrochosma limitanea (Maxon) Windham	southwestern false cloak fern
Physalis caudella Standl.	southwestern groundcherry
Glandularia gooddingii (Briq.) Solbrig	southwestern mock vervain
Achnatherum eminens (Cav.) Barkworth	southwestern needlegrass
Argemone pleiacantha Greene	southwestern pricklypoppy
Anulocaulis leiosolenus (Torr.) Standl.	southwestern ringstem
Carex bella L.H. Bailey	Southwestern Showy Sedge
Elatine rubella Rydb.	southwestern waterwort
Pinus strobiformis Engelm.	southwestern white pine
Malacothrix sonchoides (Nutt.) Torr. & A. Gray	sowthistle desertdandelion
Yucca harrimaniae Trel.	Spanish Bayonet
Spartium junceum L.	Spanish broom
Grindelia ciliata (Nutt.) Spreng.	Spanish Gold
Bidens bipinnata L.	Spanish needles
Platanthera sparsiflora (S. Watson) Schltr.	sparse-flowered bog orchid
Sphaeralcea hastulata A. Gray	spear globemallow
Matelea parvifolia (Torr.) Woodson	spearleaf
Brickellia atractyloides A. Gray	spearleaf brickellbush
Eriogonum lonchophyllum Torr. & A. Gray	Spearleaf Buckwheat
Lorandersonia linifolia (Greene) Urbatsch, R.P.Roberts & Neubig	Spearleaf Rabbitbrush
Sedum lanceolatum Torr.	spearleaf stonecrop
Mentha spicata L.	Spearmint
Wislizenia refracta Engelm.	Spectacle Fruit
Cyperus spectabilis Link	spectacular flatsedge
Asclepias asperula (Decne.) Woodson	spider milkweed
Aristida ternipes Cav.	spidergrass
Ipomoea tenuiloba Torr.	Spiderleaf
Agrostis exarata Trin.	spike bentgrass
Sporobolus contractus Hitchc.	spike dropseed
Festuca kingii (S.Watson) Cassidy	Spike Fescue
Muhlenbergia wrightii Vasey ex J.M. Coult.	Spike Muhly
Trisetum spicatum (L.) K. Richt.	Spike Trisetum
Orobanche multicaulis Brandegee	spiked broomrape
Tragus berteronianus Schult.	spiked bur grass
Hexalectris arizonica (S.Watson) A.H. Kenn. & L.E. Watson	spiked crested coralroot
Hexalectris spicata (Walter) Barnhart	spiked crested coralroot
Trachypogon spicatus (L. f.) Kuntze	spiked crinkleawn
Ipomopsis spicata (Nutt.) V.E. Grant	Spiked Ipomopsis
Desmodium cinerascens A. Gray	spiked ticktrefoil
Luzula spicata (L.) DC.	spiked woodrush
Tetradymia canescens DC.	spineless horsebrush
Chloracantha spinosa (Benth.) G.L. Nesom	Spiny Chloracantha
Pellaea truncata Goodding	spiny cliffbrake
Xanthium spinosum L.	spiny cocklebur
Glossopetalon spinescens A. Gray	spiny greasebush
Celtis ehrenbergiana (Klotzsch) Liebm.	spiny hackberry
Echinocereus dasyacanthus Engelm.	spiny hedgehog cactus
Grayia spinosa (Hook.) Moq.	spiny hopsage
Astragalus kentrophyta A. Gray	Spiny Milkvetch
Najas marina L.	spiny naiad
Carduus acanthoides L.	spiny plumeless thistle
Juncus acutus L.	spiny rush
Sonchus asper (L.) Hill	spiny sowthistle
Mentzelia tricuspis A. Gray	spinyhair blazingstar
Escobaria vivipara (Nutt.) Buxbaum	spinystar
Ruppia cirrhosa (Petagna) Grande	spiral ditchgrass
Brickellia laciniata A. Gray	splitleaf brickellbush
Giliastrum incisum (Benth.) J.M. Porter	splitleaf gilia
Castilleja rhexiifolia Rydb.	splitleaf Indian paintbrush
Phaseolus maculatus Scheele	spotted bean
Monarda punctata L.	Spotted Beebalm
Eriogonum maculatum A. Heller	spotted buckwheat
Corallorhiza maculata (Raf.) Raf.	Spotted Coralroot
Oenothera canescens Torr. & Frém.	Spotted Evening Primrose
Fritillaria atropurpurea Nutt.	spotted fritillary
Eucrypta chrysanthemifolia (Benth.) Greene	spotted hideseed
Eutrochium maculatum (L.) E.E. Lamont	Spotted Joe Pye Weed	✓
Centaurea stoebe L.	spotted knapweed
Euphorbia maculata (L.) Small	Spotted Spurge
Cicuta maculata L.	Spotted Water Hemlock
Cressa truxillensis Kunth	spreading alkaliweed
Amaranthus crassipes Schltdl.	Spreading Amaranth
Eriogonum effusum Nutt.	Spreading Buckwheat
Pectis prostrata Cav.	Spreading Chinchweed
Apocynum androsaemifolium L.	Spreading Dogbane
Hedeoma diffusa Greene	Spreading False Pennyroyal
Halimolobos diffusa (A. Gray) O.E. Schulz	spreading fissurewort
Erigeron divergens Torr. & A. Gray	spreading fleabane
Gayophytum diffusum Torr. & A. Gray	Spreading Groundsmoke
Torilis arvensis (Huds.) Link	spreading hedgeparsley
Acleisanthes diffusa (A.Gray) R.A.Levin	Spreading Moonpod
Loeflingia squarrosa Nutt.	spreading pygmyleaf
Arenaria lanuginosa (Michx.) Rohrb.	spreading sandwort
Glinus radiatus (Ruiz & Pav.) Rohrb.	Spreading Sweetjuice
Erysimum repandum L.	spreading wallflower
Elymus scribneri (Vasey) M.E. Jones	spreading wheatgrass
Rorippa sinuata (Nutt.) Hitchc.	spreading yellowcress
Carex sprengelii Dewey ex Spreng.	Sprengel's sedge
Corallorhiza wisteriana Conrad	spring coralroot
Bothriochloa springfieldii (Gould) Parodi	Springfield's beardgrass
Erigeron eximius Greene	Sprucefir Fleabane
Linum subteres (Trel.) Winkl.	Sprucemont Flax
Bouteloua chondrosioides (Kunth) Benth. ex S. Watson	sprucetop grama
Euphorbia exstipulata Engelm.	squareseed spurge
Centaurea virgata Lam.	squarrose knapweed
Elymus elymoides (Raf.) Swezey	Squirreltail
Stenotaphrum secundatum (Walter) Kuntze	St. Augustine Grass
Cylindropuntia versicolor (Engelm. ex J.M. Coult.) F.M. Knuth	staghorn cholla
Iresine heterophylla Standl.	Standley's bloodleaf
Draba standleyi J.F. Macbr. & Payson	Standley's draba
Purshia stansburiana (Torr.) Henrickson	Stansbury Cliffrose
Notholaena standleyi Maxon	star cloak fern
Lemna trisulca L.	Star Duckweed
Gilia stellata A. Heller	star gilia
Carex echinata Murray	Star Sedge
Muscari neglectum Guss. ex Ten.	starch grape hyacinth
Galium stellatum Kellogg	starry bedstraw
Maianthemum stellatum (L.) Link	Starry False Lily of the Valley
Malacothrix stebbinsii W.S. Davis & P.H. Raven	Stebbins' desertdandelion
Lupinus caespitosus Nutt.	Stemless Dwarf Lupine
Oenothera triloba Nutt.	Stemless Evening Primrose
Tetraneuris acaulis (Pursh) Greene	stemless four-nerve daisy
Aletes acaulis (Torr.) J.M. Coult. & Rose	stemless Indian parsley
Stenotus acaulis (Nutt.) Nutt.	Stemless Mock Goldenweed
Townsendia exscapa (Richardson) Porter	stemless Townsend daisy
Tetraneuris scaposa (DC.) Greene	stemmy four-nerve daisy
Nama stevensii C.L. Hitchc.	Stevens' fiddleleaf
Gilia stewartii I.M. Johnst.	Stewart's gilia
Encelia resinifera C. Clark	sticky brittlebush
Ribes viscosissimum Pursh	sticky currant
Fagonia pachyacantha Rydb.	sticky fagonbush
Teucrium glandulosum Kellogg	sticky germander
Aliciella pinnatifida (Nutt. ex A. Gray) J.M. Porter	Sticky Gilia
Cerastium glomeratum Thuill.	Sticky Mouse-Ear Chickweed
Polemonium viscosum Nutt.	Sticky Polemonium
Geranium viscosissimum Fisch. & C.A. Mey. ex C.A. Mey.	sticky purple geranium
Xanthisma viscidum (Wooton & Standl.) D.R.Morgan & R.L.Hartm.	Sticky Tansyaster
Galium aparine L.	stickywilly
Sisyrinchium demissum Greene	stiff blue-eyed grass
Lycopodium annotinum L.	Stiff Clubmoss
Oligoneuron rigidum (L.) Small	Stiff Goldenrod
Thelesperma filifolium (Hook.) A. Gray	stiff greenthread
Helianthus pauciflorus Nutt.	Stiff Sunflower
Heterotheca stenophylla (A. Gray) Shinners	stiffleaf false goldenaster
Linum rigidum Pursh	Stiffstem Flax
Cevallia sinuata Lag.	stinging serpent
Eragrostis cilianensis (All.) Vign. ex Janchen	stinkgrass
Brickellia rusbyi A. Gray	stinking brickellbush
Anthemis cotula L.	stinking chamomile
Astragalus praelongus Sheldon	stinking milkvetch
Oncosiphon piluliferum (L. f.) Källersjö	stinknet
Phacelia saxicola A. Gray	Stonecrop Phacelia
Calyptocarpus vialis Less.	Straggler Daisy
Physaria rectipes (Wooton & Standl) O'Kane & Al-Shehbaz	Straight Bladderpod
Salix ligulifolia (C.R. Ball) C.R. Ball ex C.K. Schneid.	Strapleaf Willow
Cyperus strigosus L.	Straw-Colored Flatsedge	✓
Trifolium fragiferum L.	strawberry clover
Psidium cattleianum Sabine	strawberry guava
Echinocereus stramineus (Engelm.) F. Seitz	strawberry hedgehog cactus
Arbutus unedo L.	strawberry tree
Epipactis gigantea Douglas ex Hook.	stream orchid
Polypogon elongatus Kunth	streambank rabbitsfoot grass
Claytonia parviflora Douglas ex Hook.	streambank springbeauty
Iliamna rivularis (Douglas ex Hook.) Greene	Streambank Wild Hollyhock
Setaria leucopila (Scribn. & Merr.) K. Schum.	streambed bristlegrass
Erigeron glabellus Nutt.	streamside fleabane
Forestiera pubescens Nutt.	stretchberry
Sisyrinchium montanum Greene	strict blue-eyed grass
Acmispon strigosus (Nutt.) D.D.Sokoloff	Strigose Bird's-Foot Trefoil
Chimaphila maculata (L.) Pursh	striped prince's pine
Bolboschoenus robustus (Pursh) Soják	Sturdy Bulrush
Carex alma L.H. Bailey	sturdy sedge
Grindelia subalpina Greene	Subalpine Gumweed
Delphinium barbeyi (Huth) Huth	Subalpine Larkspur
Pediomelum hypogaeum (Nutt. ex Torr. & A. Gray) Rydb.	subterranean Indian breadroot
Rhus ovata S. Watson	sugar sumac
Celtis laevigata Willd.	Sugarberry
Mimulus suksdorfii A. Gray	Suksdorf's monkeyflower
Eleocharis suksdorfiana P. Beauv.	Suksdorf's spikerush

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