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4,118 species in Yellowstone National Park
Rinodina olivaceobrunnea
Rorippa alpina
Rumex occidentalis
Sagittaria cuneata
Salix arctica
Salix brachycarpa
Salix candida
Salix cascadensis
Salix lutea
Sanicula marilandica
Sceliphron caementarium
Schinia acutilinea
Schistidium flaccidum
Schoenoplectus subterminalis
Sciurus carolinensis
Scrophularia lanceolata
Sericomyia chalcopyga
Sericomyia flagrans
Setophaga striata
Silene scouleri
Smerinthus ophthalmica
Solanum triflorum
Solenopsis carolinensis
Sorex navigator
Sorex preblei
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