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''Salix arbuscula'', the mountain willow, is a low, much branched shrub (to 0.7 metres) having a limited distribution in Northern Europe, occurring from north Scandinavia eastwards to Siberia. In Scotland it can be found on damp rocky mountain slopes and ledges, generally at altitudes above 600 metres, rarely outside Perthshire and Argyll.〔Willows and Poplars of Great Britain and Ireland, BSBI Handbook No. 4; Meikle; 1984.〕 As described in Stace〔New Flora of the British Isles; Clive Stace; Third edition; 2011 printing.〕 and BSBI〔 Salix arbuscula has the following characteristics: * Twigs slightly hairy at first, later hairless and dark reddish brown. * Leaves usually ovate up to 5cm long by 3cm wide; hairless and bright green on upper side; at first densely hairy on lower side, then hairless; margins with numerous small blunt teeth. * Petiole short, occasionally up to 8mm long but usually less than 5mm. ==References== 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 arbuscula」の詳細全文を読む スポンサード リンク
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