Distribution: Introduced occasionally, known from Seattle, Washington.
Habitat: Marshy areas, sometimes largely submerged
Flowers: June - September
Origin: Introduced from Eurasia
Conservation Status: Not of concern
, scapose perennials, the scapes up to 12 dm. tall, longer than the leaves.
Leaves all basal, long-petiolate, the blades broadly lanceolate to ovate, 5-15 cm. broad, rounded to cordate at the base.
Flowers in much-compounded, bracteate, terminal panicles, the panicles branches in 2-6 whorles along the axis, the lower branches with 2 or more secondary branchlets or pedicles; sepals 3, 3-4 mm. long, greenish; petals 3, strongly pinkish- to purplish-tinged, 4-6 mm. long; stamens 6, opposite the petals; pistils 10-20 in a single whorl; styles 0.7-1.4 mm. long, slender, straight, nearly terminal on the ovary, persistent.
Achenes obovate, 2.5-3 mm. long.
Very similar to A. triviale, differing in flower color, and the longer, slender, straight style terminal on the ovary.