Salix arbuscula
 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.As described in Staceand BSBI Salix arbuscula has the following characteristics: Twigs slightly hairy at first later hairless and dark reddish brown.