Distribution: Occurring in the northeastern corner of Washington; Alberta south to Arizona, east to central North America.
Habitat: Meadowlands and moist woods.
Conservation Status: Not of concern
Dioecious perennials from rhizomes, the stems 0.6-2 meters tall, usually branched above.
Leaves alternate, chiefly cauline, the lower ones 3-5 times ternate, the leaflets ovate to obovate, 2-3 cm. long, acutely 3-lobed, the upper surface green, the lower surface pale, strongly nerved; upper leaves reduced.
Flowers in terminal and axillary panicles; sepal 4-5, greenish-white; petals none; stamens 18-25, the slender filaments 1.6-2.3 mm. long.
Achenes about 10, oblanceolate, the body about 4 mm. long, strongly veined, narrowed to a short stipe up to 1 mm. long, the persistent style and stigma forming a beak about 3 mm. long.