果为多心皮的，有多子房雌蕊的有带两层或更多层心皮的。
只有一个心皮的雌蕊称单心皮， 具两个或更多分离的心皮称离生心皮。
A gynoecium with only one carpel is called monocarpellary; with two or more separate carpel, apocarpous; and with fused carpels syncarpous.
雄蕊和心皮的数目偶尔也发生改变，在小穗轴的叶腋处偶尔也异位产生小花。
Occasionally, the number of stamens and carpels is altered and an ectopic floret occurs in the axil of the rachilla.
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