(First upload on May 11 2008. Last on July 30 2021) [ 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.)
Lifeform: large, deciduous tree
Seed dispersal: producing long-distance wind dispersal seeds
var. japonica (Miq.) Hara
Shirakamba (シラカンバ, 白樺, s.l.), Japanese white birch
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

Pollen allergy (花粉症): a major cause of allergies, in particular, in Hokkaido. The patients often develop apple pollen allergy

Betula pendula Roth var. japonica (Miq.) Rehder
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.

Betula pendula Roth in Hokkaido University Campus

Oshu-shirakanba (オウシュウシラカンバ, 欧州白樺), silver birch, warty birch, European white birch, or East Asian white birch
Shidare-shirakanba (シダレシラカンバ, 枝垂白樺)
Distribution: Europe - Asia
Habitat: sun tree forest (as a pioneer tree)

Birch1 Birch2 Birch3
[1-3] in the Model Burns of Hokkaido University on July 2 2021. The board indicates it is B. platyphylla,