(First upload on August 25 2013. Last on November 9 2013) [ 日本語 | English ]

Betula davurica Pall.

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

Betula L. (カバノキ)
Yaegawa-kamba (ヤエガワカンバ, 八重皮樺), Asian black birch, or Dahurian birch
Ko-ono-ore (コオノオレ, 小斧折)
Lifeform: deciduous tree ≈ 15 m high
Distribution: Usri - Amur - China - Korea - northern Japan

Japan: only in Hokkaido and central Honshu (disjunct distribution) → probably related to geological timescale (Tertiary)
Red Data Book of Japan: near threatened, NT

Habitat: sunny, dry sites
Seed dispersal: wind var. okuboi Miyabe et Tatewaki (ヒダカヤエガワ): Hidaka District

Betula davurica in Hokkaido

Birch1 Birch2 Birch3
[1/2] at the arboretum (樹木園) of Hokkaido Research Center, Forestry and Forest Products Research Institute, in Hitsujigaoka, Sapporo, on July 9 2013. [3] a bark (樹皮) that is the origin of Japanese name in the Ashoro Experimental Forest of Kyushu University, eastern Hokkaido, on June 25 2013.