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2,947 species in Isle Royale National Park
Trifolium hybridum
Trillium grandiflorum
Troglodytes troglodytes
Tuber separans
Tuckermanopsis americana
Turritis glabra
Tympanis alnea
Tympanis conspersa
Ulota curvifolia
Umbilicaria phaea
Uroleucon russellae
Uromyces jacksonii
Uromyces triquetrus
Usnea capillaris
Usnea flavocardia
Usnea wasmuthii
Utricularia macrorhiza
Vallonia pulchella
Valvata sincera
Veronica arvensis
Vertigo modesta
Veronica scutellata
Caenis latipennis
Calamagrostis pickeringii
Calicium abietinum
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