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・ Salix miyabeana
・ Salix monticola
・ Salix mucronata
・ Salix myrsinifolia
・ Salix myrtillifolia
・ Salix myrtilloides
・ Salix nakamurana
・ Salix nigra
・ Salix orestera
・ Salix OS
・ Salix pentandra
・ Salix petrophila
・ Salix Pharmaceuticals
・ Salix phylicifolia
・ Salix planifolia
Salix polaris
・ Salix prolixa
・ Salix pulchra
・ Salix purpurea
・ Salix reinii
・ Salix reticulata
・ Salix retusa
・ Salix richardsonii
・ Salix rorida
・ Salix rupifraga
・ Salix schwerinii
・ Salix scouleriana
・ Salix sepulcralis group
・ Salix sericea
・ Salix serissaefolia


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Salix polaris : ウィキペディア英語版
Salix polaris

''Salix polaris'' (polar willow) is a species of willow with a circumpolar distribution in the high arctic tundra, extending north to the limits of land, and south of the Arctic in the mountains of Norway, the northern Ural Mountains, the northern Altay Mountains, Kamchatka, and British Columbia, Canada.〔Salicaceae of the Canadian Arctic Archipelago: (''Salix polaris'' )〕〔Plants of British Columbia: (''Salix polaris'' )〕〔Den Virtuella Floran: (''Salix polaris'' (in Swedish, with maps) )〕〔Germplasm Resources Information Network: (''Salix polaris'' )〕
==Description==
One of the smallest willows in the world, it is a prostrate, creeping dwarf shrub, only high, and has underground branches or runners in the uppermost soil layers. The leaves are rounded-ovate, 5-32 mm long and 8-18 mm broad, dark green and have entire margins. It is dioecious, with separate female and male plants. The flowers are grouped in short catkins each bearing only a few flowers. The fruit is a brownish and hairy capsule. The long runners with freely-rooting stems creep in mats of mosses and lichens, which keeps them together and protects them from the wind. It grows as well in open gravel as in closed vegetation.〔〔〔Blamey, M. & Grey-Wilson, C. (1989). ''Flora of Britain and Northern Europe''. ISBN 0-340-40170-2〕
Fossil remains of the species from the Pleistocene ice ages are known in Europe south to southern England, the Alps, and the Carpathians.〔
The species has also been reported from Arizona,〔〔 but this is not accepted by the USDA.〔USDA Plants Profile: (''Salix polaris'' )〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Salix polaris」の詳細全文を読む



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