Flowers: terminal; solitary; borne on long flower-stalks. Calyx: of five greenish petal-like sepals. Corolla: none. Stamens: numerous. Pistils: numerous. Fruit: thimble-shaped; a head of achenes. Leaves: opposite; and from the base deeply cleft; the divisions again cleft and toothed. Stem: tall; smooth.
The tall, stiff stalks of A. Virginiana are very noticeable in the open woods and in many dry meadows. It is best known, however, by its odd, thimble-shaped fruit.