Conservationists and an advocacy group for Native Americans are suing the U.S. to try to block a Nevada lithium mine they say will drive an endangered desert wildflower to extinction, disrupt groundwater flows and threaten cultural resources. The Center for Biological Diversity promised the court battle a week ago when the U.S. Interior Department approved Ioneer Ltd.’s Rhyolite Ridge lithium-boron mine at the only place Tiehm’s buckwheat is known to exist in the world, near the California line halfway between Reno and Las Vegas. It is the latest in a series of legal fights over projects President Joe Biden’s administration is pushing under his clean energy agenda intended to cut reliance on fossil fuels, in part by increasing the production of lithium to make electric vehicle batteries and solar panels.