Page authors: Don Knoke, David Giblin
Lupinus arboreus
tree lupine, yellow bush lupine
WTU images
WTU specimens
Other herbaria

Distribution: Occurring west of the Cascades crest in Washington in the lowlands and along the Pacific coast; British Columbia to California.

Habitat: Sandy soil at low elevations, often where disturbed.

Flowers: May-September

Origin: Introduced from California, where native

Conservation Status: Not of concern

Description:
General:

Diffusely branched, shrubby perennial 1-2 m. tall, from deep, heavy roots, silky to pubescent.

Leaves:

Leaves numerous; leaflets 5-11, oblanceolate, 3-6 cm. long, puberulent to silky.

Flowers:

Inflorescence of numerous, loose racemes, 1-2.5 dm. long; flowers 14-18 mm. long, yellow, the banner often somewhat purplish; pedicles 4-9 mm. long; calyx puberulent, two-lipped; banner well reflexed, glabrous; keel sickle-shaped, with marginal hairs.

Fruits:

Pods 4-6 cm. long and 1 cm. broad, hairy.

Accepted Name:
Lupinus arboreus Sims
Publication: Bot. Mag. 18: pl. 682. 1803. 1803.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Lupinus arboreus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Lupinus arboreus checklist entry.

E-Flora BC: Lupinus arboreus atlas page.

CalPhotos: Lupinus arboreus photos.

USDA Plants: Lupinus arboreus information.

14 photographs:
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