Branchlets brown or blackish brown; fruiting calyx strongly undulately plicate, clearly reflexed between lobes; male flowers tubular or cup-shaped, calyx lobes reduced to small teeth.

• 小枝棕色或者微黑棕色；果期花萼强烈波状折扇状，明显在之间裂片；雄花管状或者杯状，萼裂片退化至小齿(51