(First upload on May 11 2008. Last on September 13 2009) [ 日本語 | English ]

Betula platyphylla Sukaczev var. japonica (Miq.) H. Hara

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

Betula L. (カバノキ)
B. platyphylla Sukatchev (コウアンシラカンバ, s.l.)
var. japonica (Miq.) Hara
Shirakamba (シラカンバ, 白樺, s.l.), Japanese white birch
Lifeform: large, deciduous tree
Distribution of species: East Asia (northern China, Japan, Korea and Siberia)
Succession: pioneer tree after wildfire, volcanic eruption and deforestation

⇒ flora on Mount Koma, Flora on Mount Usu

Seed dispersal: producing long-distance wind dispersal seeds
Pollen allergy (花粉症): a major cause of allergies, in particular, in Hokkaido. The patients often develop apple pollen allergy

f. laciniana (Miyabe et Tatewaki) Hara (キレハシラカンバ)

var. mandshurica (Regel) Hara (カラフトシラカンバ)
var. kamtschatica (Regel) Hara (エゾノシラカンバ)
var. pluricostata (Koidz.) Tatewaki (エゾノオオシラカンバ)
var. platyphylla (コウアンシラカンバ)

moist and dry, quick absorption
tannin (adstriction effect), saponin (blood flow improvement), flavonoid (antioxidant effect) → synergetic effect + rejuvenation effect

[ Species | Hokkaido | Siberia | Morphology ]

Betula platyphylla var. japonica in Hokkaido

Birch1 Birch2 Betula3
Birch4 Shinzan5 Birch6
[1] male inflorescences on May 22, 2008, in Hokkaido University Campus. [2/6] in a park, N27/W3, East Ward, Sapporo, on July 9 2016 when a summer festival for kids were held → bark (樹皮). [3] a shoot collecred from the Hokkaido University Campus on November 11 1983. [4] a leaf (in front of O-taki Seminar House on September 8 2009). [5] a forest on the foot om Mount Showa-Shinzan was dominated by Betula platyphylla var. japonica and Populus maximowiczii. On December 18 2004, by Uraguhi A.

Betula platyphylla in Siberia


9507055 9507056
[5/6] at Spaskaya Pad, Sakha Republic, on July 5 1995. The dominant tree species in the forests were Larix gmelinii (or Larix cajanderi, recently separated from L. gmelinii) and Betula platyphylla.