Page authors: Don Knoke, David Giblin
Geum rivale
purple avens, water avens
Specimens
Photos

Distribution: Occurring east of the Cascades crest in the northeastern counties in Washington; British Columbia to northeastern Washington, east to the Rocky Mountains, northern Great Plains, Great Lakes region and northeastern North America; circumboreal.

Habitat: Stream banks, lake shores, bogs and wet meadows from middle elevations to the subalpine.

Flowers: June-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Sensitive in Washington (WANHP)

Pollination: Self-pollination, bees, flies

Description:
General:

Pubescent, herbaceous perennial from scaly rhizomes, the flowering stems 4-6 dm. tall.

Leaves:

Leaves mostly basal, several, lyrate-pinnatifid, up to 3 dm. long, the leaflets once or twice serrate, the three terminal leaflets much larger than the others; cauline leaves 3-5, reduced, pinnatifid below to deeply 3-lobed above.

Flowers:

Inflorescence open, 3- to 7-flowered, nodding in bud; calyx broadly cup-shaped, reddish-purple, the 5 lobes lanceolate and pointed, erect, 10 mm. long, alternating with 5 small, simple bracteoles; petals 5, yellow to pinkish, 2-3 mm. shorter than the sepals; stamens about 100; pistils numerous, the styles strongly bent and jointed.

Fruits:

Achenes elliptic, 3-4 mm. long, stiff-hairy, the lower joint of the style 6-8 mm. long, hooked at the tip, the upper joint 3-4 mm. long, deciduous.

Accepted Name:
Geum rivale L.
Publication: Sp. Pl. 1: 501. 1753.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Geum rivale in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Geum rivale checklist entry.

OregonFlora: Geum rivale information.

E-Flora BC: Geum rivale atlas page.

CalPhotos: Geum rivale photos.

USDA Plants: Geum rivale information.

8 photographs:
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