This bugbane almost seems like an intermediate stage between rue anemones and their dioecious relatives. It has no petals, but does have both pistils and stamens in the same flowers. Actually, it is different enough to merit its own genus, of which this is the only species. Bugbane implies that it's good for keeping bugs away, but I found no evidence of that use. These flowers are about two thirds inch across. They grow in woods in AL, AR, AZ, CA, CO, FL, GA, ID, IL, IN(X), KY, MD, MO, MS, MT, NM, NC, OR, PA(R), SC, TN, VA, WA, WV, WY, and BC; also native to Japan. Beal Gardens, MSU, 6/30/15.