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4,118 species in Yellowstone National Park
Scotochroa basalis
Semanotus amethystinus
Sialia mexicana
Silene parryi
Sisymbrium loeselii
Sparganium angustifolium
Spergularia rubra
Sphagnum russowii
Stelis calliphorina
Stenodynerus anormis
Stereocaulon alpinum
Sympetrum darwinianum
Symphyotrichum campestre
Tabanus punctifer
Tachysphex aethiops
Taraxacum ceratophorum
Terellia occidentalis
Thalictrum venulosum
Thrombium epigaeum
Tranzschelia thalictri
Trichiotinus assimilis
Tuckermanopsis chlorophylla
Veronica beccabunga
Veronica biloba
Vespula atropilosa
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