Distribution: Montana and southern Idaho, east to Quebec, then south to Florida.
Habitat: Streambanks and other moist places.
Flowers: July - September
Origin: Introduced from farther east in United States
Conservation Status: Not of concern
Perennial from a coarse, woody base, the stems up to 2 m. tall, glabrous and often glaucous.
Leaves alternate, large, petiolate, usually pinnatifid with broad segments.
Heads large, the yellow or grayish disk 1-2 cm. wide; rays 6-16, drooping, yellow, 3-6 cm. long; disk flowers numerous, fertile; receptacle hemispheric, chaffy throughout, its bracts blunt, gray-tipped; pappus a short crown.