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6,550 species in Shenandoah National Park
Sanicula marilandica
Saucrobotys futilalis
Schizura ipomaeae
Scirpus cyperinus
Scirpus georgianus
Scytinium dactylinum
Sergiolus capulatus
Silene antirrhina
Silphium perfoliatum
Solenopsis molesta
Sonchus asper
Sphecodes aroniae
Spiranthes cernua
Spizella pallida
Spoladea recurvalis
Stenochironomus hilaris
Stenolophus plebejus
Stictocephala brevitylus
Strophostyles umbellata
Syrphus ribesii
Tabanus atratus
Tanacetum parthenium
Taracticus octopunctatus
Tectella patellaris
Thamnophis saurita
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