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.
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.
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2019. E-Flora BC:
Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for
Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
20/09/2019 11:43:23 PM
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