In Conservation Biology volume 35, issue 1 (Feb. 2021) is an article titled Vascular plant extinction in the continental United States and Canada, by Wesley M. Knapp, Anne Frances, Reed Noss, Robert F. C. Naczi, Alan Weakley, George D. Gann, Bruce G. Baldwin, James Miller, Patrick McIntyre, Brent D. Mishler, Gerry Moore, Richard G. Olmstead,…