(Upload on September 26 2012) [ 日本語 | English ]
Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily
HOME > Plant list (植物リスト) > Betulaceae (カバノキ科) > Betula papyrifera
Betula L. (カバノキ)Kamikanba (カミカンバ, 紙樺) * tentative translation (not in wide use), paper birch (American white birch / canoe birch)Lifeform: deciduous tree < 30 m high Distribution: boreal regions in North America (even in Washington State) Habitat: a pioneer tree after various disturbances, including wildfire (森林火災) and logging |
Varieties: regional populations var. papyrifera var. commutata (Regel) Fern. (western paper birch) var. cordifolia (Regel) Fern. (mountain paper birch) var. kenaica (W. H. Evans) Henry (Kenai birch) var. neoalaskana (Sarg.) Raup (Alaskan paper birch) var. subcordata (Rydb.) Sarg. (northwestern paper birch) |
1. Leaves rounded in apex
2. Leaves small up to 2 cm long, crenate, serrate, petioles short, densely fine-pubescent; wing of nutlets narrow
3. Leaves orbicular, with truncate or cordate base, often broader than long, crenulated all around; decumbent dwarf shrub ___ B. nana ssp. exilis, dwarf birch 2. Leaves large ___ B. nana × B. glandulosa |
1. Leaves acute or somewhat acute in apex
2. Leaves yellowish-green, especially below, with distinctly prolonged caudate apex _____ B. occidentalis
3. Leaves triangular or diamond-shaped, with white hairs in margin; wings of nutlet as broad as body or narrower _____ B. kenaica |
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[1/2] at Poker Flat that was burnt in the summer of 2004 on August 10 2012.