E-Flora BC: Electronic Atlas of the Flora of British Columbia

Betula papyrifera var. commutata Marsh. (Regel) Fernald
paper birch
Betulaceae (Birch family)

Introduction to Vascular Plants

© Brian Klinkenberg  Email the photographer   (Photo ID #20344)

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Distribution of Betula papyrifera var. commutata
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Species Information

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General:
Deciduous tree, 10-30 m tall; bark white, yellowish- to reddish-brown or dark grey, often peeling; twigs hairy with both short and long hairs.
Leaves:
Alternate, deciduous, broadly egg-shaped in outline, the tips sharp-pointed, hairy below, rarely glandular, 4-10 cm long, leaf stalks more than 1 cm long.
Flowers:
Male and female flowers in separate catkins 2-4 cm long; flowers emerging before or with the leaves; catkins breaking up at maturity.
Fruits:
Nutlets with broad wings, at least twice as wide as the body of the nutlets; bracts with rounded, ascending or diverging lateral lobes.
Notes:
Numerous apparent hybrids between B. papyrifera and B. neoalaskana or B. occidentalis (e.g., B. x utahensis Britt. and B. subcordata Rydb.) have been formally named (see Brayshaw 1996b, Scoggan 1979). Two varieties occur in BC.

1. Mature bark white; fruiting bracts with ascending lateral lobes............... var. papyrifera

1. Mature bark white, yellowish- to reddish-brown or dark grey; fruiting bracts with lateral lobes diverging at right angles................... var. commutata (Regel) Fern.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to mesic woodlands, forests, clearcuts, burns and open areas in the lowland, steppe and montane zones; var. commutata - frequent in extreme SW BC, var. papyrifera - common throughout BC east of the Coast-Cascade Mountains; N to AK, YT and NT, E to NF, and S to MN, PA, CO and NE OR.

Source: The Illustrated Flora of British Columbia

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

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General References