E-Flora BC: Electronic Atlas of the Flora of British Columbia

Aruncus dioicus var. acuminatus (Walter) Fernald (Rydb.) Rydb. ex H. Hara
Rosaceae (Rose family)

Introduction to Vascular Plants

© Brian Klinkenberg  Email the photographer   (Photo ID #6787)

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Distribution of Aruncus dioicus var. acuminatus
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Species Information

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Robust perennial herb from stout short-creeping rhizome; stems several, erect to ascending, 1-2 m tall, smooth.
Alternate, 10-60 cm long, long-stalked, the lower leaves usually three times compound, the leaflets egg-shaped to narrowly oblong, sharply double-toothed and pointed, 3-15 cm long, the upper leaves smaller and less compounded; green and usually smooth above, hairy and paler below.
Inflorescence a large, elongated, terminal panicle with numerous spike-like branches of tiny, short-stalked flowers; male and female flowers on separate plants; corollas white, the petals 5, oblong to egg-shaped, about 1 mm long; calyces 5-toothed, the teeth shorter than the petals; ovaries superior; pistils 3 (4 or 5) in female flowers; stamens 15 to 30 in male flowers.
Follicles, bent back, more or less cylindric, somewhat leathery, straw-coloured, smooth, about 3 mm long; seeds 2 to 4 per follicle, about 2 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to wet ravines, rocky ledges, avalanche tracks, streambanks, forest edges and openings in the low land and montane zones; common in BC south of 55degreeN, rare northward; circumboreal, N to AK and S to CA; Eurasia.

Source: The Illustrated Flora of British Columbia

Additional Notes

A strong but graceful plant with tall, creamy plumes that liven up any woodland garden with height and presence. Quite long-flowering in moist spots.

Note Author: Gary Lewis, Phoenix Perennials

Taxonomic and Nomenclatural Links

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