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大胞子四分体线形排列,合点端大孢子为功能大孢子,胚囊发育类型为蓼型,具有特化的珠被绒毡层和承珠盘。
Megaspore tetrad is linear. the chalazal megaspore develops into an embryo sac of polygonum type. Hypostase and special integument tapetum exist in the ovule.
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