Anemone virginiana (Tall thimbleweed)
An adaptable wildflower that prefers a mesic to dry savanna situation, Tall Thimbleweed features clean white flowers beginning in June. The green cone-like seedhead is attractive through the summer, becoming a cottony tuft in autumn.
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Photo #2: By Randy A. Nonenmacher (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons