Megaspore tetrad is linear. The chalazal megaspore develops into an embryo sac of Polygonum type.
大孢子四分体为线形，合点端功能大孢子发育成为蓼型胚囊。
There are 4 ~ 11 antipodal cells in embryo sac of Drusa type.
德鲁撒型变型胚囊中具有4 ~ 11个反足细胞。
The development of the embryo sac conformed to the Polygonum type.
胚的发育类型为柳叶菜型，核型胚乳。
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