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4,118 species in Yellowstone National Park
Smerinthus cerisyi
Solidago simplex
Spinulum annotinum
Spiraea splendens
Stercorarius pomarinus
Sterna hirundo
Strymon melinus
Symphyotrichum bracteolatum
Syngrapha ignea
Tachysphex amplus
Taraxia breviflora
Tetragnatha versicolor
Tortula mucronifolia
Triteleia grandiflora
Trypeta flaveola
Trypoxylon frigidum
Turritis glabra
Tyrannus forficatus
Urocerus flavicornis
Uromyces bicolor
Usnea hirta
Ustilago residua
Utricularia minor
Vahlodea atropurpurea
Veronica scutellata
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