Page authors: David Giblin, Don Knoke
Hosackia crassifolia
big deervetch

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

Habitat: Moist woods and along streams, from sea level to moderate elevations in the mountains.

Flowers: May-July

Origin: Native

Growth Duration: Perennial

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, greenish-yellow, tinged with purplish-red; 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. broad.

Accepted Name:
Hosackia crassifolia Benth.
Publication: Trans. Linn. Soc. London 17(3): 365. 1836. 1836.

Synonyms & Misapplications:
Lotus crassifolius (Benth.) Greene [HC]
var. crassifolia – big deervetch
Additional Resources:

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

WA Flora Checklist: Hosackia crassifolia checklist entry.

E-Flora BC: Hosackia crassifolia atlas page.

CalPhotos: Hosackia crassifolia photos.

USDA Plants: Hosackia crassifolia information.

11 photographs:
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