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4,118 species in Yellowstone National Park
Schinia villosa
Schistidium dupretii
Schoenoplectus americanus
Scoliopteryx libatrix
Scutellaria galericulata
Senecio vulgaris
Sergiolus montanus
Setophaga nigrescens
Simulium venustum
Smerinthus cerisyi
Solidago simplex
Spinulum annotinum
Spiraea splendens
Stercorarius pomarinus
Sterna hirundo
Strymon melinus
Symphyotrichum bracteolatum
Tachysphex amplus
Taraxia breviflora
Tetragnatha versicolor
Tortula mucronifolia
Triteleia grandiflora
Trypeta flaveola
Trypoxylon frigidum
Turritis glabra
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