Page author: David Giblin
Alnus rhombifolia
California alder, white alder
WTU specimens
Other herbaria

Distribution: Chiefly east of the Cascades crest in Washington; Washington south to California and Nevada, east to Idaho.

Habitat: Near streams at low elevations.

Flowers: January-April

Origin: Native

Conservation Status: Not of concern

Description:
General:

Monoecious, deciduous small trees 5-20 m. tall, the old bark light-colored, the new growth puberulent.

Leaves:

Leaves alternate, simple, the blades elliptic or oblong-rhombic, 4-8 cm. long, acute to rounded at each end, finely to coarsely once- or twice-serrate, not wavy, hairy at least beneath, the upper surface deeper green.

Flowers:

: Catkins developing before the leaves on growth of the previous season; staminate catkins slender, pendulous, 4-8 cm. long, the stamens usually 2 per flower; pistillate catkins cone-like, woody, 10-15 mm. long, on stout peduncles often as long as the catkin.

Fruits:

Nutlet thin-margined but without a true wing.

Accepted Name:
Alnus rhombifolia Nutt.
Publication: N. Amer. Sylv. 1: 49. 1842. 1842.

Synonyms & Misapplications:
Alnus rhombifolia Nutt. var. bernardina Munz & I.M. Johnst.
Additional Resources:

PNW Herbaria: Specimen records of Alnus rhombifolia in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Alnus rhombifolia checklist entry.

E-Flora BC: Alnus rhombifolia atlas page.

CalPhotos: Alnus rhombifolia photos.

USDA Plants: Alnus rhombifolia information.

46 photographs:
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