Page authors: Don Knoke, David Giblin
Betula glandulosa
dwarf birch, resin birch, swamp birch
WTU specimens
Other herbaria

Distribution: Alaska south to the Sierra of California, east to Nevada and Colorado, and also to Newfoundland and New York.

Habitat: Stream banks, margins of marshes, lakes and bogs, and on alpine slopes.

Flowers: Late April - early July

Origin: Native

Conservation Status: Not of concern

Description:
General:

: Monoecious, deciduous shrubs 1-3 m. tall, the young branches puberulent, resinous with crystalline glands, the bark becoming reddish-brown, not peeling.

Leaves:

Leaves alternate, leathery, the blades usually oval or oblong-elliptic, 1-2 cm. long, finely serrate, glandular on both surfaces, bright green and glabrous above, paler and usually pubescent beneath.

Flowers:

Staminate catkins elongate and pendulous, 1-4 per cluster; pistillate catkins erect, 1-2.5 cm. long and 3-5 mm. thick, the naked flowers subtended by a 3-lobed bract, usually glabrous, the middle lobe narrower and longer than the other two.

Fruits:

Samara oval in outline, usually glabrous above, the wings obscure.

Accepted Name:
Betula glandulosa Michx.
Publication: Fl. Bor.-Amer. 2: 180. 1803. 1803.

Synonyms & Misapplications:
Betula crenata Rydb. ex B.T. Butler
Betula glandulosa Michx. var. glandulosa [HC]
Additional Resources:

PNW Herbaria: Specimen records of Betula glandulosa in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Betula glandulosa checklist entry.

E-Flora BC: Betula glandulosa atlas page.

CalPhotos: Betula glandulosa photos.

USDA Plants: Betula glandulosa information.

19 photographs:
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