Taxa with Images

This page provides a complete list of taxa that have images. Use the controls below to browse and search for images by family, genus, or species.
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Sabal minor
Sabatia angularis
Sabatia campestris
Sabatia gentianoides
Sabulina douglasii
Sabulina macra
Saccharum alopecuroides
Saccharum giganteum
Sacciolepis striata
Sageretia wrightii
Sagittaria australis
Sagittaria brevirostra
Sagittaria cuneata
Sagittaria graminea
Sagittaria latifolia
Sagittaria montevidensis subsp. calycina
Sagittaria platyphylla
Salicornia rubra
Salicornia utahensis
Salix alaxensis
Salix alba
Salix amygdaloides
Salix bebbiana
Salix bonplandiana
Salix candida
Salix chamissonis
Salix cinerea
Salix discolor
Salix eriocephala
Salix exigua
Salix fuscescens
Salix geyeriana
Salix glauca
Salix gooddingii
Salix hastata
Salix humilis
Salix interior
Salix irrorata
Salix laevigata
Salix lasiolepis
Salix lucida
Salix lucida subsp. lasiandra
Salix monticola
Salix myrtillifolia
Salix nigra
Salix pentandra
Salix petiolaris
Salix phlebophylla
Salix pulchra
Salix reticulata
Salix rotundifolia
Salix scouleriana
Salix sericea
Salix taxifolia
Salmo salar
Salmo trutta
Salpichroa origanifolia
Salpinctes obsoletus
Saltator coerulescens
Salvadora grahamiae
Salvadora hexalepis
Salvator merianae
Salvelinus fontinalis
Salvelinus namaycush
Salvia apiana
Salvia arizonica
Salvia azurea
Salvia clevelandii
Salvia coccinea
Salvia columbariae
Salvia dorrii subsp. mearnsii
Salvia dorrii var. clokeyi
Salvia farinacea
Salvia greggii
Salvia henryi
Salvia lycioides
Salvia lyrata
Salvia microphylla var. microphylla
Salvia pinguifolia
Salvia reflexa
Salvia rosmarinus
Salvia sclarea
Salvia subincisa
Salvia summa
Salvia tiliifolia
Salvia urticifolia
Sambucus caerulea
Sambucus canadensis
Sambucus nigra subsp. cerulea
Sambucus racemosa subsp. racemosa
Sambucus racemosa var. racemosa
Samolus ebracteatus subsp. cuneatus
Samolus vagans
Samolus valerandi
Samolus valerandi subsp. parviflorus
Sanguinaria canadensis
Sanguisorba officinalis
Sanicula bipinnatifida
Sanicula canadensis
Sanicula graveolens
Sanicula odorata
Sanicula tuberosa
Sanvitalia angustifolia
Sapindus saponaria
Sapindus saponaria subsp. drummondii
Sapindus saponaria var. saponaria
Saponaria officinalis
Sarcobatus vermiculatus
Sarcodes sanguinea
Sarcomphalus obtusifolius
Sarcomphalus obtusifolius var. canescens
Sarmentypnum exannulatum
Sarracenia purpurea
Sartwellia flaveriae
Sassafras albidum
Sauromalus ater
Saururus cernuus
Saussurea angustifolia
Saxifraga bronchialis
Saxifraga cernua
Saxifraga flagellaris
Saxifraga hirculus
Saxifraga rivularis
Saxifraga tricuspidata
Sayornis nigricans
Scabrethia scabra
Scabrostomus skillmani
Scaevola sericea
Scalopus aquaticus
Scandix pecten-veneris
Scapania uliginosa
Scapania undulata
Scapania undulata var. undulata
Scapanus latimanus
Scapanus orarius
Scapanus townsendii
Scaphinotus andrewsii
Scaphinotus angulatus
Scaphinotus angusticollis
Scaphinotus elevatus flammeus
Scaphinotus guyotii
Scaphinotus hoffmani
Scaphinotus imperfectus
Scaphinotus longiceps
Scaphinotus marginatus
Scaphinotus oreophilus
Scaphinotus petersi
Scaphinotus ridingsii
Scaphinotus unicolor
Scaphinotus viduus
Scaphiopus couchii
Scaphiopus holbrookii
Scaphiopus hurterii
Scarites ocalensis
Scarites quadriceps
Scarites subterraneus
Sceloporus bimaculosus
Sceloporus clarkii
Sceloporus clarkii clarkii
Sceloporus consobrinus
Sceloporus cowlesi
Sceloporus cyanogenys
Sceloporus graciosus
Sceloporus grammicus
Sceloporus jarrovii
Sceloporus magister
Sceloporus merriami
Sceloporus occidentalis
Sceloporus occidentalis biseriatus
Sceloporus olivaceus
Sceloporus orcutti
Sceloporus poinsettii
Sceloporus serrifer
Sceloporus slevini
Sceloporus tristichus
Sceloporus undulatus
Sceloporus uniformis
Sceloporus variabilis
Sceloporus virgatus
Sceloporus woodi
Scenedesmus acutus
Scenedesmus arcuatus
Scenedesmus armatus
Scenedesmus brasiliensis
Scenedesmus brevispina
Scenedesmus denticulatus
Scenedesmus ecornis
Scenedesmus ellipticus
Scenedesmus intermedius
Scenedesmus microspina
Scenedesmus obliquus
Scenedesmus smithii
Scenedesmus soli
Scenedesmus spinosus
Sceptridium dissectum
Schaefferellus arizonensis
Schaefferia frutescens
Scheuchzeria palustris
Schiedeella arizonica
Schinus molle
Schismus arabicus
Schismus barbatus
Schistidium rivulare
Schistocerca albolineata
Schizachne purpurascens
Schizachyrium cirratum
Schizachyrium sanguineum
Schizachyrium scoparium
Schizachyrium stoloniferum
Schizogenius amphibius
Schizogenius pygmaeus
Schizogenius sallei
Schkuhria pinnata
Schoenocaulon texanum
Schoenoplectiella hallii
Schoenoplectiella mucronata
Schoenoplectiella purshiana
Schoenoplectiella smithii
Schoenoplectus acutus
Schoenoplectus acutus var. acutus
Schoenoplectus americanus
Schoenoplectus californicus
Schoenoplectus pungens
Schoenoplectus pungens var. pungens
Schoenoplectus subterminalis
Schoenoplectus tabernaemontani
Schoenoplectus torreyi
Schoenus nigricans
Schroederia setigera
Scilla siberica
Scinax ruber
Scincella lateralis
Scirpus atrovirens
Scirpus cyperinus
Scirpus expansus
Scirpus hattorianus
Scirpus microcarpus
Scirpus pallidus
Scirpus pedicellatus
Scirpus pendulus
Scirpus polyphyllus
Sciurus aberti
Sciurus arizonensis
Sciurus carolinensis
Sciurus griseus
Sciurus nayaritensis
Sciurus niger
Scleria ciliata
Scleria lacustris
Scleria lithosperma
Scleria muehlenbergii
Scleria oligantha
Scleria pauciflora
Scleria reticularis
Scleria triglomerata
Scleria verticillata
Sclerocactus brevispinus
Sclerocactus cloverae
Sclerocactus erectocentrus
Sclerocactus erectocentrus var. acunensis
Sclerocactus intertextus
Sclerocactus intertextus var. intertextus
Sclerocactus johnsonii
Sclerocactus mesae-verdae
Sclerocactus papyracanthus
Sclerocactus parviflorus
Sclerocactus sileri
Sclerocactus spinosior
Sclerocactus uncinatus subsp. wrightii
Sclerocactus uncinatus var. wrightii
Sclerocactus wetlandicus
Sclerocactus wrightiae
Scleropodium obtusifolium
Scleropogon brevifolius
Scolia dubia
Scolopax rusticola
Scolopendra heros
Scolytus rugulosus
Scoparia dulcis
Scorpidium revolvens
Scorpidium scorpioides
Scrophularia laevis
Scrophularia lanceolata
Scrophularia macrantha
Scrophularia marilandica
Scrophularia montana
Scrophularia parviflora
Scudderia mexicana
Scutellaria brittonii
Scutellaria elliptica
Scutellaria galericulata
Scutellaria incana
Scutellaria integrifolia
Scutellaria lateriflora
Scutellaria mellichampii
Scutellaria mexicana
Scutellaria nervosa
Scutellaria parvula
Scutellaria potosina
Scutellaria potosina subsp. platyphylla
Scutellaria potosina var. platyphylla
Searsia lancea
Securigera varia
Sedum acre
Sedum cockerellii
Sedum debile
Sedum lanceolatum
Sedum purpureum
Sedum sarmentosum
Sedum spathulifolium
Sedum stelliforme
Sedum ternatum
Sedum wrightii
Selaginella apoda
Selaginella arizonica
Selaginella braunii
Selaginella eclipes
Selaginella lepidophylla
Selaginella mutica
Selaginella peruviana
Selaginella rupincola
Selaginella underwoodii
Selaginella watsonii
Selasphorus platycercus
Selasphorus rufus
Selenia aurea
Selenia dissecta
Selenidera spectabilis
Selenophorus aeneopiceus
Selenophorus aequinoctialis
Selenophorus concinnus
Selenophorus contractus
Selenophorus ellipticus
Selenophorus fatuus
Selenophorus fossulatus
Selenophorus granarius
Selenophorus maritimus
Selenophorus opalinus
Selenophorus palliatus
Selenophorus parumpunctatus
Selenophorus pedicularius
Selenophorus planipennis
Selenophorus pumilus
Sellaphora alastos
Sellaphora arvensis
Sellaphora atomoides
Sellaphora auldreekie
Sellaphora crassulexigua
Sellaphora difficillima
Sellaphora hustedtii
Sellaphora laevissima
Sellaphora meridionalis
Sellaphora mutata
Sellaphora nigri
Sellaphora parapupula
Sellaphora perhibita
Sellaphora pseudopupula
Sellaphora pulchra
Sellaphora pupula
Sellaphora raederae
Sellaphora saugerresii
Sellaphora schadei
Sellaphora seminulum
Sellaphora stauroneioides
Sellaphora stroemii
Sellaphora subfasciata
Sellaphora wallacei
Semiardistomis puncticollis
Semiclivina dentipes
Seminavis pusilla
Seminavis strigosa
Semium subglaber
Semnornis frantzii
Semotilus atromaculatus
Semotilus thoreauianus
Senecio amplectens var. holmii
Senecio arizonicus
Senecio bigelovii
Senecio crassulus
Senecio eremophilus
Senecio eremophilus var. macdougalii
Senecio flaccidus
Senecio flaccidus var. flaccidus
Senecio flaccidus var. monoensis
Senecio fremontii
Senecio fremontii var. blitoides
Senecio hydrophilus
Senecio integerrimus var. exaltatus
Senecio lemmonii
Senecio mohavensis
Senecio parryi
Senecio serra
Senecio soldanella
Senecio spartioides
Senecio sylvaticus
Senecio triangularis
Senecio vulgaris
Senecio warnockii
Senecio wootonii
Senegalia berlandieri
Senegalia greggii
Senegalia roemeriana
Senna armata
Senna artemisioides
Senna atomaria
Senna bauhinioides
Senna corymbosa
Senna covesii
Senna hebecarpa
Senna hirsuta
Senna hirsuta var. glaberrima
Senna lindheimeriana
Senna marilandica
Senna septemtrionalis
Sennius medialis
Senticolis triaspis
Sequoiadendron giganteum
Serenoa repens
Serica porcula
Sericoda quadripunctata
Serinus canaria
Serjania polyphylla
Sesbania herbacea
Sesbania sesban
Sesuvium portulacastrum
Sesuvium verrucosum
Setaria faberi
Setaria grisebachii
Setaria helvola
Setaria italica
Setaria leucopila
Setaria liebmannii
Setaria macrostachya
Setaria verticillata
Setaria viridis
Setaria viridis var. viridis
Setophaga occidentalis
Setophaga townsendi
Seymeria bipinnatisecta
Seymeria cassioides
Seymeria scabra
Shepherdia argentea
Shepherdia canadensis
Shepherdia rotundifolia
Sialia sialis
Sibbaldia procumbens
Sibinia setosa
Sibinia sibinioides
Sibinia simplex
Sibinia transversa
Sibinia variegata
Sicalis flaveola
Sicydium plumieri
Sicydium punctatum
Sicyos ampelophyllus
Sicyos angulatus
Sicyos glaber
Sicyos laciniatus
Sicyosperma gracile
Sida abutifolia
Sida acuta
Sida cordifolia
Sida neomexicana
Sida spinosa
Sidalcea candida
Sidalcea glaucescens
Sidalcea neomexicana
Sidalcea neomexicana subsp. neomexicana
Sideroxylon lanuginosum
Sideroxylon lanuginosum subsp. lanuginosum
Sideroxylon obovatum
Sidneya tenuifolia
Sigmodon arizonae
Sigmodon hispidus
Sigmodon ochrognathus
Silene acaulis
Silene antirrhina
Silene bernardina
Silene campanulata subsp. glandulosa
Silene dichotoma
Silene douglasii
Silene drummondii var. drummondii
Silene gallica
Silene laciniata
Silene laciniata subsp. californica
Silene latifolia
Silene latifolia subsp. alba
Silene lemmonii
Silene menziesii
Silene petersonii
Silene plankii
Silene regia
Silene scouleri
Silene scouleri subsp. pringlei
Silene stellata
Silene thurberi
Silene uralensis
Silene verecunda
Silene virginica
Silene vulgaris
Silene williamsii
Silene wrightii
Silphium compositum
Silphium integrifolium
Silphium laciniatum
Silphium perfoliatum
Silphium terebinthinaceum
Silybum marianum
Simmondsia chinensis
Simonsenia delognei
Siren intermedia
Siren lacertina
Sistrurus catenatus
Sistrurus catenatus tergeminus
Sistrurus miliarius
Sisymbrium altissimum
Sisymbrium irio
Sisymbrium loeselii
Sisymbrium officinale
Sisymbrium orientale
Sisyrinchium angustifolium
Sisyrinchium arizonicum
Sisyrinchium demissum
Sisyrinchium elmeri
Sisyrinchium idahoense var. occidentale
Sisyrinchium longipes
Sisyrinchium montanum
Sisyrinchium xerophyllum
Sitona californicus
Sitta carolinensis
Sium suave
Skeletonema potamos
Smallanthus uvedalia
Smelowskia ovalis
Smicronyx humilis
Smicronyx imbricatus
Smicronyx resplendens
Smilax bona-nox
Smilax ecirrhata
Smilax glauca
Smilax herbacea
Smilax illinoensis
Smilax lasioneura
Smilax laurifolia
Smilax maritima
Smilax pumila
Smilax rotundifolia
Smilax tamnoides
Smilax walteri
Smilisca baudinii
Smilisca fodiens
Solanum americanum
Solanum angustifolium
Solanum carolinense
Solanum carolinense var. carolinense
Solanum diversifolium subsp. diversifolium
Solanum douglasii
Solanum dulcamara
Solanum elaeagnifolium
Solanum heterodoxum
Solanum hindsianum
Solanum jamesii
Solanum physalifolium
Solanum stoloniferum
Solanum triflorum
Solanum xanti
Solenopsis amblychila
Solenopsis xyloni
Solidago altissima
Solidago altissima subsp. altissima
Solidago caesia
Solidago canadensis
Solidago flexicaulis
Solidago gigantea
Solidago juncea
Solidago lepida
Solidago lepida var. salebrosa
Solidago missouriensis
Solidago mollis
Solidago multiradiata
Solidago nana
Solidago nemoralis
Solidago odora
Solidago ohioensis
Solidago patula
Solidago riddellii
Solidago rigida
Solidago rigida subsp. rigida
Solidago rugosa
Solidago simplex
Solidago simplex var. simplex
Solidago speciosa
Solidago ulmifolia
Solidago velutina
Solidago wrightii
Somotrichus unifasciatus
Sonchus arvensis
Sonchus asper
Sonchus oleraceus
Sonora semiannulata
Sophora nuttalliana
Sophora secundiflora
Sophora stenophylla
Sorastrum spinulosum
Sorbus americana
Sorbus aucuparia
Sorbus californica
Sorbus dumosa
Sorbus scopulina
Sorbus sitchensis
Sorex arcticus
Sorex bendirii
Sorex cinereus
Sorex dispar
Sorex fumeus
Sorex haydeni
Sorex hoyi
Sorex longirostris
Sorex merriami
Sorex minutissimus
Sorex monticolus
Sorex nanus
Sorex obscurus
Sorex ornatus
Sorex pacificus
Sorex pacificus bairdi
Sorex palustris
Sorex preblei
Sorex rohweri
Sorex tenellus
Sorex trowbridgii
Sorex tundrensis
Sorex ugyunak
Sorex vagrans
Sorghastrum nutans
Sorghastrum secundum
Sorghum bicolor
Sorghum drummondii
Sorghum halepense
Sparganium americanum
Sparganium emersum
Sparganium eurycarpum
Spathodea campanulata
Spea bombifrons
Spea hammondii
Spea intermontana
Spea multiplicata
Spergularia marina
Spergularia media
Spermacoce confusa
Spermolepis echinata
Spermophilus musicus
Sphaeralcea ambigua
Sphaeralcea ambigua var. rosacea
Sphaeralcea angustifolia
Sphaeralcea angustifolia var. oblongifolia
Sphaeralcea coccinea
Sphaeralcea coccinea var. elata
Sphaeralcea coulteri
Sphaeralcea digitata
Sphaeralcea digitata subsp. digitata
Sphaeralcea emoryi
Sphaeralcea fendleri
Sphaeralcea fendleri subsp. fendleri
Sphaeralcea fendleri var. venusta
Sphaeralcea fumariensis
Sphaeralcea gierischii
Sphaeralcea grossulariifolia
Sphaeralcea hastulata
Sphaeralcea incana
Sphaeralcea laxa
Sphaeralcea leptophylla
Sphaeralcea munroana
Sphaeralcea parvifolia
Sphaeralcea rusbyi
Sphaeralcea wrightii
Sphaerellocystis ampla
Sphaerobothris ulkei
Sphaerodactylus argus
Sphaerodactylus elegans
Sphaerodactylus macrolepis
Sphaerodactylus micropithecus
Sphaerodactylus nicholsi nicholsi
Sphaerodactylus roosevelti
Sphaeroderus bicarinatus
Sphaeroderus canadensis canadensis
Sphaeroderus canadensis lengi
Sphaeroderus schaumii
Sphaeroderus stenostomus
Sphaeroderus stenostomus lecontei
Sphaerophysa salsula
Sphaerozosma laeve
Sphagneticola trilobata
Sphagnum subsecundum
Sphagnum teres
Sphenopholis filiformis
Sphenopholis obtusata
Sphinctospermum constrictum
Sphyrapicus nuchalis
Sphyrapicus ruber
Spicaticribra kingstonii
Spigelia marilandica
Spilogale gracilis
Spilogale putorius
Spinulum annotinum
Spinulum annotinum subsp. annotinum
Spinus psaltria
Spiraea alba
Spiraea alba var. latifolia
Spiraea betulifolia var. aemiliana
Spiraea betulifolia var. lucida
Spiraea douglasii
Spiraea japonica
Spiraea tomentosa
Spiranthes cernua
Spiranthes diluvialis
Spiranthes lucida
Spiranthes magnicamporum
Spiranthes romanzoffiana
Spiranthes vernalis
Spirulina major
Spizaetus ornatus
Spizella passerina
Spizella wortheni
Spondylosium planum
Spondylosium pulchellum
Spondylosium pulchellum var. bambusinoides
Spondylosium pulchrum
Spondylosium secedens
Spondylosium tetragonum
Sporobolus airoides
Sporobolus compositus
Sporobolus contractus
Sporobolus cryptandrus
Sporobolus flexuosus
Sporobolus giganteus
Sporobolus heterolepis
Sporobolus indicus
Sporobolus michauxianus
Sporobolus nealleyi
Sporobolus neglectus
Sporobolus pyramidatus
Sporobolus rigidus var. magnus
Sporobolus vaginiflorus
Sporobolus wrightii
Spragueia funeralis
Stachys ajugoides
Stachys byzantina
Stachys coccinea
Stachys cordata
Stachys floridana
Stachys hyssopifolia
Stachys rothrockii
Stachys tenuifolia
Stachytarpheta jamaicensis
Stanleya elata
Stanleya pinnata
Stanleya viridiflora
Staphylea trifolia
Staphylus ceos
Staurastrum alternans
Staurastrum anatinum
Staurastrum ankyroides
Staurastrum arachne
Staurastrum bicoronatum
Staurastrum cerastes
Staurastrum comptum f. reductum
Staurastrum concinnum
Staurastrum connatum
Staurastrum curvatum
Staurastrum curvatum var. elongatum
Staurastrum dejectum
Staurastrum dejectum var. patens
Staurastrum diacanthum
Staurastrum diacanthum var. evolutum
Staurastrum distentum
Staurastrum elongatum
Staurastrum excavatum
Staurastrum extensum
Staurastrum glaphyrum var. denticulatum
Staurastrum gracile var. tenuissimum
Staurastrum hexacerum
Staurastrum hystrix
Staurastrum inconspicuum
Staurastrum inflexum
Staurastrum iotanum
Staurastrum johnsonii
Staurastrum lanceolatum
Staurastrum lapponicum
Staurastrum leptocladum
Staurastrum longispinum
Staurastrum margaritaceum
Staurastrum megacanthum
Staurastrum micron
Staurastrum natator
Staurastrum octoverrucosum var. simplicius
Staurastrum orbiculare
Staurastrum pentacerum
Staurastrum pseudobacillare
Staurastrum punctulatum
Staurastrum punctulatum var. pygmaeum
Staurastrum radians
Staurastrum ralfsii
Staurastrum simonyi
Staurastrum striolatum
Staurastrum subgrande var. minor
Staurastrum tenuissimum
Staurastrum tetracerum
Staurodesmus cuspidatus
Staurodesmus extensus
Staurodesmus incus
Staurodesmus octocornis
Staurodesmus omearae
Staurodesmus ralfsii
Staurodesmus subulatus
Staurodesmus triangularis
Stauroforma exiguiformis
Stauroneis acidoclinata
Stauroneis anceps
Stauroneis baconiana
Stauroneis borrichii
Stauroneis circumborealoides
Stauroneis gracilis
Stauroneis kriegeri
Stauroneis livingstonii
Stauroneis neohyalina
Stauroneis obtusa
Stauroneis parathermicola
Stauroneis phoenicenteron
Stauroneis pikuni
Stauroneis producta
Stauroneis reichardtii
Stauroneis separanda
Stauroneis smithii
Stauroneis smithii var. incisa
Stauroneis subborealis
Stauroneis subgracilis
Stauroneis thermicola
Staurosira construens
Staurosira construens f. subsalina
Staurosira construens var. binodis
Staurosira construens var. venter
Staurosira mutabilis
Staurosira venter
Staurosirella leptostauron
Staurosirella leptostauron var. dubia
Staurosirella pinnata
Stellaria calycantha
Stellaria cuspidata
Stellaria graminea
Stellaria longifolia
Stellaria longipes
Stellaria media
Stellaria nitens
Stellaria pubera
Stemodia durantifolia
Stenandrium barbatum
Stenaria nigricans
Stenaria nigricans var. nigricans
Stenaspis solitaria
Stenocereus thurberi
Stenocrepis mexicana
Stenocrepis tibialis
Stenogonum flexum
Stenogonum salsuginosum
Stenolophus comma
Stenolophus infuscatus
Stenolophus lecontei
Stenolophus lineola
Stenolophus ochropezus
Stenolophus plebejus
Stenomorphus californicus rufipes
Stenopelmatus fuscus
Stenopterobia anceps
Stenopterobia curvula
Stenopterobia delicatissima
Stenosiphon linifolius
Stenostomum acutatum
Stenotis greenei
Stenotus acaulis
Stephanodiscus agassizensis
Stephanodiscus alpinus
Stephanodiscus binderanus
Stephanodiscus hantzschii
Stephanodiscus hantzschii f. tenuis
Stephanodiscus medius
Stephanodiscus minutulus
Stephanodiscus niagarae
Stephanodiscus parvus
Stephanodiscus reimeri
Stephanomeria exigua
Stephanomeria pauciflora
Stephanomeria tenuifolia
Stephanomeria thurberi
Stephanomeria virgata
Stereocerus haematopus
Stereocerus rubripes
Stereochilus marginatus
Sternotherus carinatus
Sternotherus depressus
Sternotherus minor
Sternotherus odoratus
Stevia lemmonii
Stevia micrantha
Stevia plummerae
Stevia serrata
Stewartia malacodendron
Stibaera thyatiroides
Stigmaphyllon emarginatum
Stigmaphyllon floribundum
Stigonema ocellatum
Stillingia linearifolia
Stillingia spinulosa
Stillingia sylvatica
Stipa comata
Stipa curvifolia
Stipa diegoensis
Stipa eminens
Stipa nelsonii
Stipa neomexicana
Stipa perplexa
Stipa richardsonii
Stipa robusta
Stipa spartea
Stipulicida setacea
Stomis pumicatus
Storeria dekayi
Storeria occipitomaculata
Storeria occipitomaculata obscura
Storeria victa
Straminergon stramineum
Streptanthella longirostris
Streptanthus carinatus
Streptanthus carinatus subsp. arizonicus
Streptanthus cordatus
Streptanthus tortuosus
Streptopelia decaocto
Streptoprocne semicollaris
Streptoprocne zonaris
Streptopus amplexifolius
Streptopus lanceolatus
Strigosella africana
Strix occidentalis
Strophostyles leiosperma
Strymon melinus
Stuckenia pectinata
Stylisma humistrata
Stylocline micropoides
Stylophorum diphyllum
Stylosanthes biflora
Styrax grandifolius
Suaeda nigra
Subularia aquatica subsp. americana
Suckleya suckleyana
Sula nebouxii
Sula variegata
Surirella adumbratus
Surirella amphioxys
Surirella angusta
Surirella biseriata
Surirella brebissonii
Surirella brebissonii var. kuetzingii
Surirella crumena
Surirella helvetica
Surirella iowensis
Surirella linearis
Surirella minuta
Surirella ovalis
Surirella roba
Surirella robusta
Surirella splendida
Surirella suecica
Surirella tenera
Surirella turgida
Swertia perennis
Sylvilagus aquaticus
Sylvilagus audubonii
Sylvilagus bachmani
Sylvilagus floridanus
Sylvilagus nuttallii
Sylvilagus obscurus
Sylvilagus palustris
Sylvilagus transitionalis
Sympetrum corruptum
Symphoricarpos albus
Symphoricarpos albus var. laevigatus
Symphoricarpos longiflorus
Symphoricarpos microphyllus
Symphoricarpos occidentalis
Symphoricarpos orbiculatus
Symphoricarpos oreophilus
Symphoricarpos rotundifolius
Symphoricarpos rotundifolius var. parishii
Symphoricarpos rotundifolius var. rotundifolius
Symphyotrichum ascendens
Symphyotrichum boreale
Symphyotrichum ciliatum
Symphyotrichum cordifolium
Symphyotrichum drummondii
Symphyotrichum dumosum
Symphyotrichum ericoides
Symphyotrichum ericoides var. ericoides
Symphyotrichum falcatum var. commutatum
Symphyotrichum falcatum var. falcatum
Symphyotrichum foliaceum
Symphyotrichum foliaceum var. foliaceum
Symphyotrichum foliaceum var. parryi
Symphyotrichum laeve
Symphyotrichum laeve var. laeve
Symphyotrichum lanceolatum
Symphyotrichum lanceolatum subsp. lanceolatum
Symphyotrichum lanceolatum var. hesperium
Symphyotrichum lanceolatum var. lanceolatum
Symphyotrichum lateriflorum
Symphyotrichum novae-angliae
Symphyotrichum patens
Symphyotrichum pilosum
Symphyotrichum porteri
Symphyotrichum puniceum
Symphyotrichum puniceum var. puniceum
Symphyotrichum sericeum
Symphyotrichum shortii
Symphyotrichum spathulatum
Symphyotrichum spathulatum var. spathulatum
Symphyotrichum spathulatum var. yosemitanum
Symphyotrichum subulatum
Symphyotrichum subulatum var. ligulatum
Symphyotrichum subulatum var. parviflorum
Symplocarpus foetidus
Symplocos tinctoria
Synandra hispidula
Synaptomys cooperi
Synchlora frondaria
Synedra cyclopum
Synedra goulardi
Synedra rumpens
Synedra rumpens f. familiaris
Synedra ulna var. ramesi
Synedrella nodiflora
Synetocephalus atricornis
Syngonanthus flavidulus
Synthliboramphus antiquus
Synthliboramphus craveri
Synthliboramphus hypoleucus
Synthlipsis greggii
Syntomus americanus
Syntrichia ruralis
Synuchus impunctatus
Syrbula montezuma
Syrigma sibilatrix
Syringa vulgaris
Syrmatium argophyllum
Syrmatium glabrum
Systasea zampa