Thimbleweed (Tall Anemone)
Perennial herb with a erect, unbranched stalk. Flowers about 1 inch across, usually 1–3, with 5 off-white or greenish-white sepals (there are no petals). Fruits are densely clustered at the center in a thimble-shaped dome, thus the name “thimbleweed.” Blooms April–August. Leaves 3-divided with deeply cleft and large-toothed leaflets, the basal leaves and the stem leaves on petioles, the basal on very long stems. Fruits when mature are a fluffy, white mass of seeds that often remains on the stalk through the winter.