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4,849 species in Grand Canyon National Park
Tramea darwini
Trapeliopsis granulosa
Acarospora cervina
Trichoderma spirale
Tricholoma saponaceum
Trogloderus costatus
Andrena chapmanae
Trupanea nigricornis
Typha latifolia
Tyto furcata
Ulmus pumila
Umbilicaria torrefacta
Uromyces viciae-fabae
Urosaurus graciosus
Ursus americanus
Urtica gracilis
Vespula atropilosa
Vinca major
Walshomyia juniperina
Woodsia mexicana
Woodsia neomexicana
Xanthomendoza ulophyllodes
Xema sabini
Andrena evoluta
Xysticus lassanus
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