Top
Header

(Upload on Januray 16 2009) [ 日本語 | English ]

Dryas integrifolia Vahl






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

[ specimen ]

Dryas L. (チョウノスケソウ)


a group of dwarf perennial plants in Rosaceae, native to arctic and alpine of circumpolar regions → geological timescale (地質年代)
Characterized by eight petals
Nitrogen fixation: by Frankia
Three species in the world. One species (D. octopetala var. asiatica) in Japan
D. drummondii Richardson ex. Hook. (D. avens キバナチョウノスケソウ)
Synonyms:

D. octopetala L. var. integrifolia Hook.
D. tenella Pursh
D. sylvatica Hult.

D. integrifolia Vahl (マルバチョウノスケソウ)
D. octopetala L. (Mountain avens キョクチチョウノスケソウ)

var. asiatica (Nakai) Nakai (チョウノスケソウ)

Hybrid: Dryas × suendermannii = D. drummondii × D. octopetala
索引
In Russian Botanical Book
We see five more species
D. ajanensis Juz.
D. crenulata Juz.
D. grandis Juz.
D. octopetala L.
D. viscosa Juz.

drummondii1 integrifolia2 cotopetala3
1 D. drummondii. 2 D. integrifolia. 3. D. octopetala

Dryas integrifolia in Alaska


Maruba-chounosukesou (マルバチョウノスケソウ, 丸葉長之助草), entireleaf mountain avens
Lifeform: evergreen dwarf shrub
Distribution: circumpolar
Habitat: rocky bluff, tundra

ST1 ST2 ST3
[1-3] near Toolik Lake LTER Station on August 8 2009. LTER = long-term ecological research (長期生態学研究)

フッター