Sagina saginoides --- arctic pearlwort
Sagittaria cuneata --- arumleaf arrowhead
Sagittaria latifolia --- broadleaf arrowhead
Salicornia rubra --- red swampfire
Salix alba --- white willow
Salix amygdaloides --- peachleaf willow
Salix barclayi --- Barclay's willow
Salix barrattiana --- Barratt's willow
Salix bebbiana --- Bebb willow
Salix boothii --- Booth's willow
Salix brachycarpa --- shortfruit willow
Salix candida --- sageleaf willow
Salix cascadensis --- cascade willow
Salix discolor --- pussy willow
Salix drummondiana --- Drummond's willow
Salix eastwoodiae --- mountain willow
Salix exigua --- narrowleaf willow
Salix farriae --- Farr's willow
Salix fragilis --- crack willow
Salix geyeriana --- Geyer's willow
Salix glauca --- grayleaf willow
Salix glauca ssp. glauca --- grayleaf willow
Salix glauca ssp. glauca var. villosa --- grayleaf willow
Salix interior --- sandbar willow
Salix irrorata --- dewystem willow
Salix lemmonii --- Lemmon's willow
Salix ligulifolia --- strapleaf willow
Salix lucida --- shining willow
Salix lucida ssp. caudata --- greenleaf willow
Salix lutea --- yellow willow
Salix melanopsis --- dusky willow
Salix monticola --- park willow
Salix myrtillifolia --- blueberry willow
Salix nivalis --- snow willow
Salix pentandra --- laurel willow
Salix petrophila --- alpine willow
Salix planifolia --- diamondleaf willow
Salix prolixa --- MacKenzie's willow
Salix pseudomonticola --- false mountain willow
Salix reticulata --- netleaf willow
Salix reticulata ssp. reticulata --- netleaf willow
Salix rotundifolia --- least willow
Salix rotundifolia ssp. dodgeana --- timberline willow
Salix ×rubens --- hybrid crack willow
Salix scouleriana --- Scouler's willow
Salix serissima --- autumn willow
Salix ×solheimii
Salix tweedyi --- Tweedy's willow
Salix wolfii --- Wolf's willow
Salsola collina --- slender Russian thistle
Salsola tragus --- prickly Russian thistle
Salvia nemorosa --- woodland sage
Salvia pratensis --- introduced sage
Salvia reflexa --- lanceleaf sage
Sambucus nigra --- European black elderberry
Sambucus nigra ssp. canadensis --- common elderberry
Sambucus nigra ssp. cerulea --- blue elderberry
Sambucus racemosa --- red elderberry
Sambucus racemosa var. melanocarpa --- black elderberry
Sambucus racemosa var. racemosa --- red elderberry
Sanguisorba minor --- small burnet
Sanguisorba minor ssp. muricata --- small burnet
Sanicula canadensis --- Canadian blacksnakeroot
Sanicula canadensis var. canadensis --- Canadian blacksnakeroot
Sanicula graveolens --- northern sanicle
Sanicula marilandica --- Maryland sanicle
Saponaria officinalis --- bouncingbet
Sarcobatus vermiculatus --- greasewood
Saussurea weberi --- Weber's saw-wort
Saxifraga adscendens --- wedgeleaf saxifrage
Saxifraga adscendens ssp. oregonensis --- small saxifrage
Saxifraga bronchialis --- yellowdot saxifrage
Saxifraga bronchialis ssp. austromontana --- matted saxifrage
Saxifraga caespitosa --- tufted alpine saxifrage
Saxifraga caespitosa ssp. caespitosa --- tufted alpine saxifrage
Saxifraga caespitosa ssp. monticola --- tufted alpine saxifrage
Saxifraga cernua --- nodding saxifrage
Saxifraga chrysantha --- goldbloom saxifrage
Saxifraga ferruginea --- russethair saxifrage
Saxifraga ferruginea var. vreelandii --- Vreeland's saxifrage
Saxifraga flagellaris --- whiplash saxifrage
Saxifraga flagellaris ssp. crandallii --- Crandall's saxifrage
Saxifraga nidifica --- peak saxifrage
Saxifraga nidifica var. nidifica --- peak saxifrage
Saxifraga occidentalis --- Alberta saxifrage
Saxifraga odontoloma --- brook saxifrage
Saxifraga oppositifolia --- purple mountain saxifrage
Saxifraga oppositifolia ssp. oppositifolia --- purple mountain saxifrage
Saxifraga rhomboidea --- diamondleaf saxifrage
Saxifraga rivularis --- weak saxifrage
Saxifraga subapetala --- Yellowstone saxifrage
Schedonnardus paniculatus --- tumblegrass
Scheuchzeria palustris --- rannoch-rush
Scheuchzeria palustris ssp. americana --- rannoch-rush
Schizachne purpurascens --- false melic
Schizachyrium scoparium --- little bluestem
Schizachyrium scoparium var. scoparium --- little bluestem
Schoenocrambe linifolia --- flaxleaf plainsmustard
Schoenoplectus acutus --- hardstem bulrush
Schoenoplectus acutus var. acutus --- hardstem bulrush
Schoenoplectus acutus var. occidentalis --- tule
Schoenoplectus americanus --- chairmaker's bulrush
Schoenoplectus heterochaetus --- slender bulrush
Schoenoplectus maritimus --- cosmopolitan bulrush
Schoenoplectus ×oblongatus
Schoenoplectus pungens --- common threesquare
Schoenoplectus pungens var. longispicatus --- common threesquare
Schoenoplectus saximontanus --- Rocky Mountain bulrush
Schoenoplectus subterminalis --- swaying bulrush
Schoenoplectus tabernaemontani --- softstem bulrush
Scirpus atrocinctus --- blackgirdle bulrush
Scirpus microcarpus --- panicled bulrush
Scirpus nevadensis --- Nevada bulrush
Scirpus pallidus --- cloaked bulrush
Scolochloa festucacea --- common rivergrass
Scorzonera laciniata --- cutleaf vipergrass
Scrophularia lanceolata --- lanceleaf figwort
Scutellaria brittonii --- Britton's skullcap
Scutellaria galericulata --- marsh skullcap
Secale cereale --- cereal rye
Sedum debile --- orpine stonecrop
Sedum lanceolatum --- spearleaf stonecrop
Sedum lanceolatum ssp. lanceolatum --- spearleaf stonecrop
Sedum lanceolatum ssp. subalpinum --- subalpine stonecrop
Sedum stenopetalum --- wormleaf stonecrop
Sedum stenopetalum ssp. stenopetalum --- wormleaf stonecrop
Selaginella densa --- lesser spikemoss
Selaginella densa var. densa --- lesser spikemoss
Selaginella densa var. scopulorum --- Rocky Mountain spikemoss
Selaginella densa var. standleyi --- Standley's spikemoss
Selaginella mutica --- bluntleaf spikemoss
Selaginella mutica var. mutica --- bluntleaf spikemoss
Selaginella rupestris --- northern selaginella
Selaginella selaginoides --- club spikemoss
Selaginella underwoodii --- Underwood's spikemoss
Selaginella watsonii --- Watson's spikemoss
Senecio amplectens --- showy alpine ragwort
Senecio amplectens var. holmii --- Holm's ragwort
Senecio atratus --- tall blacktip ragwort
Senecio bigelovii --- nodding ragwort
Senecio bigelovii var. hallii --- Hall's ragwort
Senecio crassulus --- thickleaf ragwort
Senecio eremophilus --- desert ragwort
Senecio eremophilus var. eremophilus --- desert ragwort
Senecio eremophilus var. kingii --- King's ragwort
Senecio fremontii --- dwarf mountain ragwort
Senecio fremontii var. blitoides --- dwarf mountain ragwort
Senecio fremontii var. fremontii --- dwarf mountain ragwort
Senecio hydrophiloides --- tall groundwel
Senecio hydrophilus --- water ragwort
Senecio integerrimus --- lambstongue ragwort
Senecio integerrimus var. exaltatus --- Columbia ragwort
Senecio integerrimus var. integerrimus --- lambstongue ragwort
Senecio lugens --- small blacktip ragwort
Senecio megacephalus --- rocky ragwort
Senecio rapifolius --- openwoods ragwort
Senecio riddellii --- Riddell's ragwort
Senecio serra --- tall ragwort
Senecio serra var. admirabilis --- tall ragwort
Senecio serra var. serra --- tall ragwort
Senecio spartioides --- broomlike ragwort
Senecio spartioides var. multicapitatus --- broomlike ragwort
Senecio spartioides var. spartioides --- broomlike ragwort
Senecio sphaerocephalus --- ballhead ragwort
Senecio triangularis --- arrowleaf ragwort
Senecio vulgaris --- old-man-in-the-Spring
Setaria italica --- foxtail bristlegrass
Setaria verticillata --- hooked bristlegrass
Setaria viridis --- green bristlegrass
Setaria viridis var. viridis --- green bristlegrass
Shepherdia argentea --- silver buffaloberry
Shepherdia canadensis --- russet buffaloberry
Shinnersoseris rostrata --- beaked skeletonweed
Shoshonea pulvinata --- Shoshone carrot
Sibbaldia procumbens --- creeping sibbaldia
Sidalcea candida --- white checkerbloom
Sidalcea candida var. glabrata --- white checkerbloom
Sidalcea neomexicana --- salt spring checkerbloom
Sidalcea neomexicana ssp. neomexicana --- salt spring checkerbloom
Sidalcea oregana --- Oregon checkerbloom
Sidalcea oregana ssp. oregana --- Oregon checkerbloom
Sidalcea oregana ssp. oregana var. oregana --- Oregon checkerbloom
Silene acaulis --- moss campion
Silene acaulis var. subacaulescens --- moss campion
Silene antirrhina --- sleepy silene
Silene dichotoma --- dichotoma silene
Silene drummondii --- Drummond's campion
Silene drummondii var. drummondii --- Drummond's campion
Silene drummondii var. kruckebergii --- Kruckeberg's campion
Silene drummondii var. striata --- Drummond's campion
Silene kingii --- King's campion
Silene latifolia --- bladder campion
Silene latifolia ssp. alba --- bladder campion
Silene menziesii --- Menzies' campion
Silene menziesii ssp. menziesii --- Menzies' campion
Silene menziesii ssp. menziesii var. menziesii --- Menzies' campion
Silene menziesii ssp. menziesii var. viscosa --- Menzies' campion
Silene noctiflora --- nightflowering silene
Silene oregana --- Oregon silene
Silene parryi --- Parry's silene
Silene pendula --- nodding catchfly
Silene repens --- pink campion
Silene repens ssp. australis --- pink campion
Silene uralensis --- apetalous catchfly
Silene uralensis ssp. montana --- apetalous catchfly
Silene vulgaris --- maidenstears
Silphium integrifolium --- wholeleaf rosinweed
Silphium integrifolium var. laeve --- wholeleaf rosinweed
Sinapis alba --- white mustard
Sinapis arvensis --- charlock mustard
Sisymbrium altissimum --- tall tumblemustard
Sisymbrium loeselii --- small tumbleweed mustard
Sisymbrium officinale --- hedgemustard
Sisyrinchium idahoense --- Idaho blue-eyed grass
Sisyrinchium idahoense var. idahoense --- Idaho blue-eyed grass
Sisyrinchium idahoense var. occidentale --- Idaho blue-eyed grass
Sisyrinchium montanum --- strict blue-eyed grass
Sisyrinchium montanum var. montanum --- strict blue-eyed grass
Sisyrinchium pallidum --- pale blue-eyed grass
Sium suave --- hemlock waterparsnip
Smelowskia calycina --- alpine smelowskia
Smelowskia calycina var. americana --- American false candytuft
Smilax glauca --- cat greenbrier
Smilax lasioneura --- Blue Ridge carrionflower
Solanum dulcamara --- climbing nightshade
Solanum dulcamara var. dulcamara --- climbing nightshade
Solanum interius --- deadly nightshade
Solanum physalifolium --- hoe nightshade
Solanum rostratum --- buffalobur nightshade
Solanum triflorum --- cutleaf nightshade
Solidago canadensis --- Canada goldenrod
Solidago canadensis var. gilvocanescens --- shorthair goldenrod
Solidago canadensis var. salebrosa --- salebrosa goldenrod
Solidago gigantea --- giant goldenrod
Solidago missouriensis --- Missouri goldenrod
Solidago missouriensis var. fasciculata --- Missouri goldenrod
Solidago missouriensis var. missouriensis --- Missouri goldenrod
Solidago mollis --- velvety goldenrod
Solidago mollis var. mollis --- velvety goldenrod
Solidago multiradiata --- Rocky Mountain goldenrod
Solidago multiradiata var. scopulorum --- manyray goldenrod
Solidago nana --- baby goldenrod
Solidago nemoralis --- gray goldenrod
Solidago nemoralis var. longipetiolata --- gray goldenrod
Solidago simplex --- Mt. Albert goldenrod
Solidago simplex ssp. simplex --- Mt. Albert goldenrod
Solidago simplex ssp. simplex var. simplex --- Mt. Albert goldenrod
Solidago speciosa --- showy goldenrod
Solidago speciosa var. pallida --- showy goldenrod
Solidago speciosa var. rigidiuscula --- showy goldenrod
Solidago velutina --- threenerve goldenrod
Sonchus arvensis --- field sowthistle
Sonchus arvensis ssp. arvensis --- field sowthistle
Sonchus arvensis ssp. uliginosus --- moist sowthistle
Sonchus asper --- spiny sowthistle
Sonchus oleraceus --- common sowthistle
Sophora nuttalliana --- silky sophora
Sorbus scopulina --- Greene's mountain ash
Sorbus scopulina var. scopulina --- Greene's mountain ash
Sorghastrum nutans --- Indiangrass
Sorghum bicolor --- sorghum
Sorghum bicolor ssp. bicolor --- grain sorghum
Sorghum halepense --- Johnsongrass
Sparganium angustifolium --- narrowleaf bur-reed
Sparganium erectum --- simplestem bur-reed
Sparganium erectum ssp. stoloniferum --- simplestem bur-reed
Sparganium eurycarpum --- broadfruit bur-reed
Sparganium natans --- small bur-reed
Spartina gracilis --- alkali cordgrass
Spartina pectinata --- prairie cordgrass
Spergula arvensis --- corn spurry
Spergularia diandra --- diandra sandspurry
Spergularia rubra --- red sandspurry
Spergularia salina --- salt sandspurry
Sphaeralcea coccinea --- scarlet globemallow
Sphaeralcea coccinea ssp. coccinea --- scarlet globemallow
Sphaeralcea coccinea ssp. elata --- scarlet globemallow
Sphaeralcea munroana --- Munro's globemallow
Sphaeralcea munroana ssp. munroana --- Munro's globemallow
Sphaeralcea munroana ssp. subrhomboidea --- whitestem globemallow
Sphaeromeria argentea --- silver chickensage
Sphaeromeria capitata --- rock tansy
Sphaeromeria simplex --- Laramie chickensage
Sphaerophysa salsula --- alkali swainsonpea
Sphenopholis intermedia --- slender wedgescale
Sphenopholis obtusata --- prairie wedgescale
Spiraea betulifolia --- white spirea
Spiraea betulifolia var. lucida --- shinyleaf spirea
Spiraea splendens --- rose meadowsweet
Spiraea splendens var. splendens --- rose meadowsweet
Spiranthes diluvialis --- diluvim ladies'-tresses
Spiranthes romanzoffiana --- hooded ladies'-tresses
Spirodela polyrrhiza --- common duckmeat
Sporobolus airoides --- alkali sacaton
Sporobolus compositus --- composite dropseed
Sporobolus compositus var. compositus --- composite dropseed
Sporobolus cryptandrus --- sand dropseed
Sporobolus heterolepis --- prairie dropseed
Sporobolus neglectus --- puffsheath dropseed
Stachys pilosa --- hairy hedgenettle
Stachys pilosa var. pilosa --- hairy hedgenettle
Stanleya pinnata --- desert princesplume
Stanleya pinnata var. bipinnata --- bipinnate princesplume
Stanleya pinnata var. pinnata --- desert princesplume
Stanleya tomentosa --- woolly princesplume
Stanleya tomentosa var. tomentosa --- woolly princesplume
Stanleya viridiflora --- green princesplume
Stellaria borealis --- boreal starwort
Stellaria borealis ssp. borealis --- boreal starwort
Stellaria calycantha --- northern starwort
Stellaria crassifolia --- fleshy starwort
Stellaria crassifolia var. crassifolia --- fleshy starwort
Stellaria crispa --- curled starwort
Stellaria longifolia --- longleaf starwort
Stellaria longifolia var. longifolia --- longleaf starwort
Stellaria longipes --- longstalk starwort
Stellaria media --- common chickweed
Stellaria media ssp. media --- common chickweed
Stellaria obtusa --- Rocky Mountain chickweed
Stellaria umbellata --- umbrella starwort
Stenogonum salsuginosum --- salty buckwheat
Stenosiphon linifolius --- false gaura
Stenotus acaulis --- stemless mock goldenweed
Stenotus acaulis var. acaulis --- stemless mock goldenweed
Stenotus acaulis var. glabratus --- stemless mock goldenweed
Stenotus armerioides --- thrift mock goldenweed
Stenotus armerioides var. armerioides --- thrift mock goldenweed
Stephanomeria exigua --- small wirelettuce
Stephanomeria exigua ssp. exigua --- small wirelettuce
Stephanomeria minor --- lesser wirelettuce
Stephanomeria minor var. minor --- narrowleaf wirelettuce
Stephanomeria minor var. myrioclada --- narrowleaf wirelettuce
Stephanomeria pauciflora --- brownplume wirelettuce
Stephanomeria runcinata --- desert wirelettuce
Streptanthella longirostris --- longbeak streptanthella
Streptanthus cordatus --- heartleaf twistflower
Streptanthus cordatus var. cordatus --- heartleaf twistflower
Streptopus amplexifolius --- claspleaf twistedstalk
Streptopus amplexifolius var. amplexifolius --- claspleaf twistedstalk
Stuckenia filiformis --- fineleaf pondweed
Stuckenia filiformis ssp. alpinus --- fineleaf pondweed
Stuckenia filiformis ssp. occidentalis --- western fineleaf pondweed
Stuckenia pectinatus --- sago pondweed
Stuckenia vaginatus --- sheathed pondweed
Suaeda calceoliformis --- Pursh seepweed
Suaeda moquinii --- Mojave seablite
Subularia aquatica --- waterawlwort
Subularia aquatica var. americana --- American waterawlwort
Suckleya suckleyana --- poison suckleya
Sullivantia hapemanii --- Hapeman's coolwort
Sullivantia hapemanii var. hapemanii --- Hapeman's coolwort
Swertia perennis --- felwort
Symphoricarpos albus --- common snowberry
Symphoricarpos albus var. albus --- common snowberry
Symphoricarpos albus var. laevigatus --- common snowberry
Symphoricarpos occidentalis --- western snowberry
Symphoricarpos oreophilus --- mountain snowberry
Symphoricarpos oreophilus var. utahensis --- Utah snowberry
Symphyotrichum ascendens --- western aster
Symphyotrichum boreale --- northern bog aster
Symphyotrichum campestre --- western meadow aster
Symphyotrichum campestre var. campestre --- western meadow aster
Symphyotrichum ciliatum --- rayless alkali aster
Symphyotrichum ciliolatum --- Lindley's aster
Symphyotrichum cusickii --- Cusick's aster
Symphyotrichum eatonii --- Eaton's aster
Symphyotrichum ericoides --- white heath aster
Symphyotrichum ericoides var. pansum --- manyflowered aster
Symphyotrichum ericoides var. stricticaule --- white heath aster
Symphyotrichum falcatum --- white prairie aster
Symphyotrichum falcatum var. commutatum --- white prairie aster
Symphyotrichum falcatum var. crassulum --- white prairie aster
Symphyotrichum falcatum var. falcatum --- white prairie aster
Symphyotrichum foliaceum --- alpine leafybract aster
Symphyotrichum foliaceum var. apricum --- alpine leafybract aster
Symphyotrichum foliaceum var. canbyi --- Canby's aster
Symphyotrichum foliaceum var. parryi --- Parry's aster
Symphyotrichum frondosum --- short-rayed alkalai aster
Symphyotrichum laeve --- smooth blue aster
Symphyotrichum laeve var. geyeri --- Geyer's aster
Symphyotrichum lanceolatum --- white panicle aster
Symphyotrichum lanceolatum ssp. hesperium --- white panicle aster
Symphyotrichum lanceolatum ssp. hesperium var. hesperium --- white panicle aster
Symphyotrichum molle --- soft aster
Symphyotrichum novae-angliae --- New England aster
Symphyotrichum oblongifolium --- aromatic aster
Symphyotrichum porteri --- smooth white aster
Symphyotrichum spathulatum --- western mountain aster
Symphyotrichum spathulatum var. intermedium --- larger western mountain aster
Symphyotrichum spathulatum var. spathulatum --- western mountain aster
Synthyris pinnatifida --- featherleaf kittentails
Synthyris pinnatifida var. pinnatifida --- featherleaf kittentails
Syringa reticulata --- Japanese tree lilac
Syringa reticulata ssp. amurensis --- Amur lilac

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