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(Upload on December 15 2014) [ 日本語 | English ]

Betula L. (カバノキ) in Alaska Himekamba (ヒメカンバ, 姫樺), dwarf birch Lifeform: dwarf shrub Distribution: arctic and cool temperate regions Habitat: widespread in arctic tundra Leaf: orbicular, with truncate or cordate base, often broader than long, crenulated all around Seed dispersal: wind Chromosome number: 2n = 28 ssp. nana: young twigs hairy without resin, leaves longer (to 20 mm), usually as long as broad, not in AK

ssp. exilis (Sukaczev) Hultén: young twigs hairless or with only scattered hairs with coated in resin, leaves shorter (< 12 mm long), often broader than long Synonyms: Betula exilis Sukaczev, Betula nana var. sibirica Ledeb. ssp. perfiljevii (V. N. Vassil.) A. Love et D. Love, discarded ⇔ B. glandulosa Michx., resin birch or shrub birch Leaf: obovate, with cuneate toothless base

Betula nana in Alaska

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[1-3] ssp. exilis in a tussock-shrub tundra near Toolik Lake LTER Station, on August 3 2014.