Mature embryo sac has 8 nucleis.Egg cell has obvious polarity.One synergid degenerates before fertilization, the other does after fertilization.

• 成熟胚囊为八核七细胞，卵细胞极性明显，助细胞在极核融合前已退化一个，另一个宿存，宿存助细胞丝状器明显，并保留退化助细胞的痕迹。