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2,976 species in Lassen Volcanic National Park
Stellaria media
Stenochidus robustus
Stenolophus anceps
Stenolophus incultus
Stercorarius parasiticus
Stereum sanguinolentum
Stethophyma lineatum
Stratiomys maculosa
Streptocephalus coloradensis
Streptocephalus sealii
Strongylogaster distans
Stropharia ambigua
Strophiona tigrina
Swertia perennis
Sympetrum madidum
Symphyotrichum ascendens
Symphyotrichum bracteolatum
Symphyotrichum subspicatum
Sympistis californiae
Synanthedon novaroensis
Synchlora aerata
Syntexis libocedrii
Syntrichia laevipila
Syntrichia norvegica
Tanacetum vulgare
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