Branchlets brown, with numerous tuberculate lenticels, puberulent.小枝使成褐色，带有许多具瘤皮孔，被微柔毛。
Collections from alpine habitats in NW Yunnan, which have puberulent male inflorescences and perianth lobes, may be ecological forms.采自云南西北部高山生境的标本，有被微柔毛的雄花序和花被裂片，可能是生态型。
