FILE - In this Feb. 10, 2020, file photo, a plant ecologist at the University of Nevada, Reno, points to a tiny Tiehm's buckwheat that has sprouted at a campus greenhouse in Reno, Nevada. Few people had ever heard of Tiehm's buckwheat when conservationists filed a petition two years earlier to list the desert wildflower as an endangered species. But federal documents reviewed by The Associated Press show the rare plant at the center of a fight over a proposed lithium mine in Nevada has been on the government's radar for more than two decades. (AP Photo/Scott Sonner, File)
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