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4,118 species in Yellowstone National Park
Tibellus oblongus
Tipula dorsimacula
Tonestus lyallii
Toninia squalida
Townsendia exscapa
Townsendia montana
Toxascaris leonina
Trichordestra liquida
Trichordestra tacoma
Trifolium haydenii
Trimerotropis gracilis
Trirhabda canadensis
Acarospora fuscata
Ulothrix zonata
Umbilicaria hirsuta
Urocystis agropyri
Uromyces erythronii
Uromyces glycyrrhizae
Usnea glabrata
Ustilago striiformis
Utricularia macrorhiza
Valeriana acutiloba
Vanessa virginiensis
Veronica alpina
Buprestis langii
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