Iowa Wildflowers : Buttercup - when it flowers, it's habitat, and some historical uses
The Buttercup is a plant that grows in moist to wet areas, blooming April through September, depending on the species, of which there are many. It has single 1-inch wide, 5 (sometimes 7) yellow-petaled flowers that grow from the end of a stalk. The plant is native to cold temperate regions throughout the United States and Europe. This plant is considered poisonous. From the book Wildflowers of Iowa's Woodlands : "Some tribes of Indians pulverized buttercup roots, soaked the pulp in warm water, and used the resulting liquid as a wash for open wounds. Canadian Indians inhaled the vapor of crushed leaves of one species to cure headache. A preparation of the roots was also used to stop persistent nosebleed. One unspecified species of buttercup was used by the ancients to poison arrow tips. Another was supposed to cure lunacy, if applied to the neck during the wane of the moon provided the moon was in the sign of the bull or the scorpion. Pliny the elder, anci