在雌花中雌蕊原基出现后雌花进一步发育，花芽的中心凹陷发育为下位子房，雄蕊的花药原基中并未分化出小孢子母细胞。
Following the formation of pistil primordium in the female flower , the center of the flower begins to cave in to form the ovary , however the microsporocytes have not differentiated within the anther primordia .
下位子房