Distribution: British Columbia to Quebec, south to Arizona and Florida
Habitat: Stream banks and other moist, low ground in the valleys and foothills.
Flowers: July - September
Conservation Status: Not of concern
Fibrous-rooted perennial, 1.5-12 dm. tall, nearly glabrous.
Leaves numerous, lanceolate, narrowed to a sessile base from which wings are formed along the stem, only slightly reduced upward, 4-15 cm. long and 5-40 mm. wide, usually shallowly toothed, the lowest early-deciduous.
Heads usually numerous, sub-globose, the disk yellow, 1-2 cm. wide; involucral bracts narrow, herbaceous, soon deflexed; rays 10-20, pistillate, wedge-shaped, 3-lobed, yellow, soon deflexed; pappus of several series of papery scales, lanceolate or ovate, long-pointed, 2 mm. long.
Achenes truncately obpyramidal, 4-5 angled and ribbed.