Cytokinesis in the megaspore mother cell accompanies meiosis and the Chalaza megaspore of a linear three cells develops into 8-nuclealeate.The development of embryo sac is of the Polygonum type.

• 大孢子母细胞减数分裂形成三分体即3个大孢子，合点端的大孢子发育为胚囊，胚囊蓼型。