(First upload on September 22 2008. Last on July 18 2021) [ 日本語 | English ]

Geum macrophyllum Willd.

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

Geum L. (ダイコンソウ)
G. macrophyllum Willd.
var. macrophyllum, the type
var. sachalinense (Koidz.) H. Hara
Karafutodaikonsou (カラフトダイコンソウ, 樺太大根草), largeleaf avens
Lifeform: Large, deciduous perennial forb
Distribution: Sakhalin - Japan (central Honshu - Hokkaido) - Kuril
Habitat: mainly grasslands

Flora on Mount Usu

Seedbank (埋土種子): well-developed (survived for more than 30 years in the former topsoil under thick volcanic deposits on Mount Usu (Tsuyuzaki 2010)

Geum aleppicum Jacq. var. sachalinense (Koidz.) Ohwi
Geum japonicum Thunb. var. sachalinense Koidz.
Geum macrophyllum Willd. ssp. fauriei (H.Lév.) Vorosch.


Geum macrophyllum in Hokkaido

Mount Usu (有珠山)

Avens1 Avens2
[1/2] rosettes in the crater basin on September 19, 2008. The seeds were extracted from the former topsoil under thick volcanic deposits, by a centrifuged flotation method, 20 years after the eruptions.

Hokkaido (北海道)

Avens3 Avens4 Avens5
[3] at Goshiki Spa, Niseko, on June 26 2006. [4/5] at a field trip near Usujiri Fisheries Station of Hokkaido University, southern Hokkaido, on June 17 2015. [6] along Fureai Course in Nopporo Forest Park on July 17 2021.