(First upload on July 31 2010. Last on July 16 2017) [ 日本語 | English ]

Alnus hirsuta Turcz.

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

Alnus Mill. (ハンノキ)
Yamahannoki (ヤマハンノキ, 山榛ノ木, s.l.), manchurian alder
Life form: deciduous, pioneer tree < 20 m in height
var. hirsuta
Keyamahannoki (ケヤマハンノキ, 毛山榛ノ木)
Distribution: northeast Asia, including Japan → Flora on Mount Usu
Habitat: secondary forests (often used for erosion control)

Field training on integrated environmental research (統合環境調査法実習)

var. microphylla (Nakai) Tatewaki (コバノヤマハンノキ/タニガワハンノキ), separated to A. inokumae Murai et Kusaka
Distribution: north to central Honshu
Leaf: smaller than the type, much silky hair on the back

Alnus inokumae Murai et Kusaka

var. sibirica (Fischer) C. K. Schn. (ヤマハンノキ/マルバハンノキ, s.s.)
Leaf: pruinose and hairless on the back

Alnus hirsuta in Hokkaido

Alnus1 Alnus2 Alnus3
Alnus4 Alnus5 bark
[1/2] in the caldera rim of Mount Usu on July 21 2010. [3] a sapling on a slope of Tomamu skislope on July 19 2012. [4-6] along Shunbetsu River, south-central Hokkaido, on June 14 2016 (bark, 樹皮). Records: in the Forest of Hokkaido People (道民の森), 3rd River, Kamui-jiri, Aoyama, Tobetsu Town, on July 18 2022.

Mount Koma

Alnus1 Alnus2 Alnus3 Alnus4
[1-3] on the southwestern slope of Mount Koma (flora) on July 10 2017. [4] many galls formed by Eriophyidae (フシダニ) on the trail near the parking lot on June 9 2018.