Page authors: Don Knoke, David Giblin
Geum macrophyllum
bigleaf avens, large-leaved avens

Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to Baja California, east to the Great Plains and east across Canada to the Atlantic Coast.

Habitat: Common in moist woods and meadows from sea level to subalpine.

Flowers: April-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Self-pollination, bees, flies


Herbaceous perennial from a short rhizome, the 1-several pubescent stems 3-7 dm. tall.


Basal leaves several, the blades lyrate-pinnatifid, up to 3 dm. long; leaflets 9-23, triangular-ovate to cordate, the terminal one much the largest, up to 15 cm. wide; cauline leaves 2-5, with leaf-like stipules.


Flowers several in an open, asymmetrical inflorescence; calyx saucer-shaped, the 5 lobes 4-5 mm. long, reflexed, alternating with 5 simple bracteoles; petals 5, yellow, 4-6 mm. long; stamens and pistils numerous.


Achenes compressed, elliptic, 3 mm. long, the style bent and divided at mid-length, the lower segment 4 mm. long, reddish, hooked at the tip, the upper segment 1-1.5 mm. long, yellowish.

Accepted Name:
Geum macrophyllum Willd.
Publication: Enum. Pl. [Willdenow] 1: 557. 1809.

Synonyms & Misapplications:
Geum macrophyllum Willd. ssp. macrophyllum
Geum macrophyllum Willd. ssp. perincisum (Rydb.) Hultén
Geum macrophyllum Willd. var. macrophyllum [HC]
Geum macrophyllum Willd. var. perincisum (Rydb.) Raup [HC]
Geum macrophyllum Willd. var. rydbergii Farw.
Geum oregonense (Scheutz) Rydb.
Geum perincisum Rydb.
Geum perincisum Rydb. var. intermedium B. Boivin
Additional Resources:

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

WA Flora Checklist: Geum macrophyllum checklist entry

OregonFlora: Geum macrophyllum information

E-Flora BC: Geum macrophyllum atlas page

CalPhotos: Geum macrophyllum photos

68 photographs:
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