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

[ specimen ]

Dryas L. (チョウノスケソウ)

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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

In Russian Botanical Book We see five more species D. ajanensis Juz. D. crenulata Juz. D. grandis Juz. D. octopetala L. D. viscosa Juz.

1 2 3
1 D. drummondii. 2 D. integrifolia. 3. D. octopetala

Dryas integrifolia in Alaska

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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

1 2 3
[1-3] near Toolik Lake LTER Station on August 8 2009. LTER = long-term ecological research (長期生態学研究)