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。