Page author: David Giblin
Aruncus dioicus
WTU specimens
Other herbaria

Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska south to California.

Habitat: Moist woods, low to mid-elevations in the mountains.

Flowers: May-July

Origin: Native

Conservation Status: Not of concern

Description:
General:

Dioecious, rhizomatous, perennial herbs, the several glabrous stems 1-2 m. tall.

Leaves:

Leaves numerous, mostly cauline, long-petiolate, reduced upward from imperfectly triternate-pinnatifid below to ternate-pinnatifid above; leaflets ovate to oblong-lanceolate, pointed, up to 15 cm. long and 8 cm. broad, sharply twice-serrate.

Flowers:

Inflorescence a large terminal panicle of numerous spike-like, racemose branches; calyx 1.5-2 mm. broad, the 5 triangular lobes spreading; petal 5, white, about 1 mm. long in the pistillate flowers; staminate flowers with 15-20 stamens.

Fruits:

Ovary superior; pistils 3, distinct; follicles 3 mm. long.

Accepted Name:
Aruncus dioicus (Walt.) Fern.

Synonyms:
(none provided)
Infraspecies:
var. acuminatus    West of the Cascades, Alaska to California, and east to the Selkirk Mountains in Washington and British Columbia
Additional Resources:

PNW Herbaria: Specimen records of Aruncus dioicus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Aruncus dioicus checklist entry.

E-Flora BC: Aruncus dioicus atlas page.

CalPhotos: Aruncus dioicus photos.

USDA Plants: Aruncus dioicus information.

28 photographs:
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