Symphyotrichum lanceolatum

Symphyotrichum lanceolatum (formerly Aster lanceolatus and Aster simplex) is a species of flowering plant in the family Asteraceae native to North America. Common names include panicled aster, lance-leaved aster, and white panicled aster. It is a perennial, herbaceous plant that may reach 1.5 meters (5 feet) tall or more, sometimes approaching 2 m (6+1⁄2 ft). The lance-shaped leaves are generally hairless but may feel slightly rough to the touch on the top because of tiny bristles. S. lanceolatum blooms July to October. The flowers grow in clusters and branch in panicles. They have 16–50 white ray florets that are up to 14 millimeters (1⁄2 inch) long and sometimes tinged pink or purple. The flower centers consist of disk florets that begin as yellow and become purple as they mature. The species occurs in a wide variety of mostly moist and open habitats, including riparian areas (areas between land and a river or stream), meadows, and ditches. Panicled aster has a stout rhizome and can ......read more on Wikipedia.