Page authors: Don Knoke, David Giblin
Hosackia rosea
rosy bird's-foot-trefoil

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

Habitat: Moist woods and along streams.

Flowers: May-July

Origin: Native

Conservation Status: Not of concern


Glabrous, rhizomatous perennial, the stems hollow, erect to spreading, 2-10 dm. tall.


: Leaves odd-pinnate, 5-15 cm. long, with a short petiole: leaflets 9-15, oblong to oblong-obovate, 1-3 cm. long, bright green on the upper surface, glaucous below; stipules triangular, membranous, 4-10 mm. long.


Inflorescence of bracteate umbels on long peduncles, the bracts 3- to 5-foliate or occasionally simple, attached somewhat above mid-length; umbels 7-20 flowered, the pedicels 1-4 mm. long; flowers 8-13 mm. long, white to pink, lined with deep pink; calyx tubular, 4-5 mm. long, the 5 triangular teeth much shorter than the tube; corolla pea-like.


Pod flattened, 2.5-4.5 cm. long and 3-4 mm. wide.

Accepted Name:
Hosackia rosea Eastw.
Publication: Proc. Calif. Acad. Sci. ser. 2, 6: 424, tab. 55. 1896. 1896.

Synonyms & Misapplications:
Lotus aboriginus Jeps. [JPM]
Lotus crassifolius (Benth.) Greene var. subglaber (Ottley) C.L. Hitchc. [HC]
Lotus stipularis (Benth.) Greene var. subglaber Ottley
Additional Resources:

PNW Herbaria: Specimen records of Hosackia rosea in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Hosackia rosea checklist entry.

E-Flora BC: Hosackia rosea atlas page.

CalPhotos: Hosackia rosea photos.

USDA Plants: Hosackia rosea information.

16 photographs:
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