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''Salix lapponum'', the downy willow, is a low, much branched shrub (to 1.5 metres) having a wide distribution in Northern Europe, eastwards to the Altai and western Siberia, and is found as far south as the Pyrenees and Bulgaria. In Scotland it can be found on rocky mountain slopes and cliffs, generally at altitudes between 200 and 900 metres.〔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 lapponum has the following characteristics: * Twigs hairy at first, hairless and rather glossy dark reddish brown later. * Leaves usually lanceolate to 7cm long by 2.5cm wide; slightly hairy to hairy on upper side; usually densely hairy on lower side; margins entire or subentire, sometimes a little undulate. * Petiole short, occasionally up to 1cm 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 lapponum」の詳細全文を読む スポンサード リンク
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