Female and male inflorescences all cymose-paniculate; achene ovoid or oblong; basal veins on leaf blade even or sunken adaxially.

• 二歧聚伞状的雌花序，有时密集成簇；雄花序二歧聚伞状，圆锥状或聚伞状；瘦果近球形；在叶片正面突出上的基出脉。(32