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4,118 species in Yellowstone National Park
Salix cascadensis
Salix lutea
Brundiniella eumorpha
Sanicula marilandica
Sceliphron caementarium
Schinia acutilinea
Schistidium flaccidum
Bryum argenteum
Schoenoplectus subterminalis
Sciurus carolinensis
Scrophularia lanceolata
Sericomyia chalcopyga
Sericomyia flagrans
Setophaga striata
Silene scouleri
Smerinthus ophthalmica
Solanum triflorum
Solenopsis carolinensis
Sorex navigator
Sorex preblei
Sparganium emersum
Sphagnum teres
Sphagnum warnstorfii
Spharagemon campestris
Bupleurum americanum
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