Mahonia nervosa
Cascade Oregon-grape, dull Oregon-grape

Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to western Montana.

Habitat: Generally in light woodland and forest edge.

Flowers: April-May

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Low, evergreen shrubs generally 0.1-0.3 m, occasionally taller; glabrous, brown to yellow-brown bark.

Leaves :

Leaves alternate, pinnately-compound, leathery; leaflets 9-21, glossy to somewhat dull and glaucous, lance-ovate to ovate, 3-8 cm long and 1-5 cm broad, 4-6 veins from base, somewhat dull and glaucous, 6-13 spine-tipped teeth.

Flowers :

Inflorescences dense racemes, 6-17 cm long with 30-70 flowers; bracts 3, greenish-yellow, 2-3 mm long; sepals 6, yellow, 6-8 mm long; petals 6, yellow, bi-lobed; stamens 6, opposite of petals; pair of lateral teeth absent from filaments; style none, stigma sessile.

Fruits :

Berries blue, glaucous, juicy, solid, oblong-ovoid to globose, 8-11 mm.

Accepted Name:
Mahonia nervosa (Pursh) Nutt.
Publication: Gen. N. Amer. Pl. [Nuttall]. 1: 212. 1818.

Synonyms & Misapplications:
Berberis nervosa Pursh [FNA3, HC, HC2]
Berberis nervosa Pursh var. mendocinensis Roof
Mahonia nervosa (Pursh) Nutt. var. mendocinensis (Roof) Roof
Odostemon nervosus (Pursh) Rydb.
Additional Resources:

PNW Herbaria: Specimen records of Mahonia nervosa in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Mahonia nervosa checklist entry

OregonFlora: Mahonia nervosa information

E-Flora BC: Mahonia nervosa atlas page

CalPhotos: Mahonia nervosa photos

53 photographs:
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