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3,375 species in Joshua Tree National Park
Ulmus parvifolia
Urbanus proteus
Uromyces junci
Uromyces proeminens
Uropyxis amorphae
Urosaurus nigricauda
Verbena rigida
Verbesina encelioides
Veronica peregrina
Verrucaria aethiobola
Verrucaria sphaerospora
Vireo olivaceus
Vireo philadelphicus
Vitis arizonica
Volvopluteus gloiocephalus
Walterella ocellata
Weissia controversa
Wilcoxia martinorum
Wohlfahrtia vigil
Woodsia plummerae
Xanthoparmelia cumberlandia
Xenoglossa strenua
Xerasia grisescens
Xeropsamobeus doyeni
Zacosmia maculata
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