Page authors: Don Knoke, David Giblin
Comarum palustre
marsh cinquefoil, purple marshlocks
WTU specimens
Other herbaria

Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across the northern portion of North America to the Atlantic Coast.

Habitat: Bogs, wet meadows and lake margins, sea level to subalpine.

Flowers: June-August

Origin: Native

Conservation Status: Not of concern

Description:
General:

Herbaceous perennial from strong rhizomes, with floating or prostrate, reddish stems up to 1 m. long, glabrous below, becoming hairy and purplish-glandular above. The tips of floating stems often turn upright.

Leaves:

Leaves alternate, pinnate, the leaflets 5-7, mostly glabrous and light green on the upper surface, paler, glaucous, and appressed-silky on the lower, obovate to narrowly elliptic-oblong, 3-6 cm. long, serrate.

Flowers:

Flowers several in open cymes, deep wine-red; tubular part of the calyx bowl-shaped, 5-8 mm. broad; calyx lobes 5, greenish-purple, glandular, ovate-lanceolate, pointed, spreading, 7-11 mm. long, alternating with shorter and narrower bracteoles; petals 5, ovate-lanceolate to elliptic, pointed, about equal to the bracteoles; stamens about 25; pistils many; style reddish, smooth, slender, uniform in diameter, inserted on the side of the ovary, 1.5-2 mm. long.

Fruits:

Achenes broadly ovate, brownish-purple, plump, smooth, 1.5 mm. long.

Accepted Name:
Comarum palustre L.
Publication: Sp. Pl. 1: 502. 1753. 1753.

Synonyms & Misapplications:
Comarum palustris var. villosum Pers.
Potentilla palustris (L.) Scop. [HC]
Potentilla palustris (L.) Scop. var. parvifolia (Raf.) Fernald & Long
Potentilla palustris (L.) Scop. var. villosa (Pers.) Lehm.
Potentilla palustris (L.) Scop. var. villosum (Pers.) Lehm.
Additional Resources:

PNW Herbaria: Specimen records of Comarum palustre in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Comarum palustre checklist entry.

E-Flora BC: Comarum palustre atlas page.

CalPhotos: Comarum palustre photos.

USDA Plants: Comarum palustre information.

28 photographs:
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