Vascular Plants - Betulaceae - Betula:
Betula papyrifera
paper birch 
Blooms: March - May
Habit: tree
Duration: perennial
Origin: Native
Distribution: Alaska to Oregon, east of the Cascades except in northwest Washington, east to the Atlantic coast
Habitat: Moist, open to dense woods, low to moderate elevations
Species Description:

General: Monoecious, deciduous small tree 15-20 m. tall, the young twigs puberulent and covered with flattened glands that are more or less peltate and not at all resinous; older wood from cherry to chalky-white and peeling.
Leaves: Leaves alternate, the blades narrowly ovate to nearly rotund, 4-7 cm. long, once- or twice-serrate, occasionally shallowly lobed, often glabrous on the greener upper surface, pubescent beneath, with tufts of stiff hairs in the axils of the larger lateral veins.
Flowers: Staminate catkins elongate and pendulous, 1-4 per cluster; pistillate catkins erect, 3-5 cm. long, borne singly, the naked flowers subtended with a 3-lobed bract 5-7 mm. long, with marginal hairs.
Fruits: Samara, the wings as broad as the nutlet.
Accepted Name:
Betula papyrifera Marsh.
Synonyms:
Betula alba L.
Betula alba L. var. commutata Regel
Betula montanensis
Betula papyrifera Marsh. var. commutata (Regel) Fern.

Treated in Flora of the PNW as:
Betula papyrifera
Additional Resources:

PNW Herbaria Specimens: View list of all Betula papyrifera specimens in the Consortium of Pacific Northwest Herbaria database.

WTU Herbarium Specimens: View list of Betula papyrifera specimens in the WTU Herbarium database.

Washington Flora Checklist: Betula papyrifera treatment.

E-Flora BC: Betula papyrifera atlas page.

CalPhotos: Betula papyrifera images.

USDA Plants Database: Betula papyrifera.
Additional photographs of Betula papyrifera:
(click on a thumbnail to view larger photo)

Clayton J. Antieau, 1991

Ben Legler, 2004

Ben Legler, 2004

Ben Legler, 2004

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

G. D. Carr, 2010

G. D. Carr, 2010

G. D. Carr, 2010

G. D. Carr, 2010

G. D. Carr, 2010

G. D. Carr, 2010

G. D. Carr, 2010

G. D. Carr, 2010

G. D. Carr, 2010

G. D. Carr, 2010

Craig Althen, 2010

Ben Legler, 2011

Susan McDougall, 2011

Susan McDougall, 2008

Robert L. Carr, 2015

Robert L. Carr, 2015
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Washington Native Plant Society
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