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2,976 species in Lassen Volcanic National Park
Soyedina nevadensis
Sphaerium simile
Sphaerophoria sulphuripes
Sphagnum fimbriatum
Sphagnum miyabeanum
Sphagnum rubellum
Sphagnum squarrosum
Sphinx drupiferarum
Sphyrapicus varius
Spilomyia foxleei
Sporormiella intermedia
Sporormiella teretispora
Stachys albens
Stamnoctenis pearsalli
Stamnoctenis rubrosuffusa
Stegonia latifolia
Stellaria media
Stenochidus robustus
Stenolophus anceps
Stenolophus incultus
Stercorarius parasiticus
Stereum sanguinolentum
Stethophyma lineatum
Stratiomys maculosa
Streptocephalus coloradensis
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