Distribution: Introdued and widespread in eastern United States; uncommon in the Pacific Northwest.
Habitat: Moist soil and waste places.
Flowers: August - October
Conservation Status: Not of concern
Perennial with tuber-bearing rhizomes, the stem stout, pubescent, 0.7-5 m. tall.
Leaves opposite below and alternate above, broadly lanceolate to ovate, acuminate, 10-25 cm. long and 4-12 cm. wide, with winged petioles 2-8 cm. long, the blades serrate, scabrous above.
Heads usually numerous, the disk 1.5-2.5 cm. wide, the receptacle chaffy; involucre bracts dark, narrowly lanceolate, acuminate, exceeding the disk, scabrous on the back; disk flowers yellow, perfect; ray flowers 10-20, yellow, neutral, 2-4 cm. long; pappus of 2 deciduous awns.
Achenes thick, compressed.