Anemone patens L.
other common names: April fool, badger, Easter plant, gosling, hartshorn, prairie smoke (also applied to another plant), rock lily, wild crocus, windflower, prairie crocus
Anemone: the ancient Greek and Latin name, a variation of the Semitic name for the mythological Adonis, from whose blood a crimson-flowered Anemone of the Orient is said to have sprung
Patens: from Latin, meaning "spreading"
Buttercup family: Ranunculaceae
Photograph by Thomas Rosburg, from Wildflowers of the Tallgrass Prairie: The Upper Midwest, Second Edition