子房是被子植物生长种子的器官，位置不定，依和雌蕊的相对位置可分为上位花、下位花或是周位花。一般略为膨大。子房里面有一至多室，每室内含有一至多个胚珠，胚珠受精后可以发育为种子。

受精后，胚珠发育成种子，子房壁最后发育成果皮，包裹种子，有的种类形成果肉，如桃、苹果等。

子房的组成单元是心皮，被子植物的子房由1至多个心皮所组成。由一个心皮构成的雌蕊称单雌蕊，其子房只有一室；由多个心皮构成的雌蕊称复雌蕊或合心皮雌蕊，多心皮（2个以上的心皮愈合）的子房常有多室，其室数与合生的心皮数相当，每一室内可以有一个或多个胚珠（成熟后发育成种子）。这些胚珠在子房中的着生位置称之为胎座，不同的着生类型称为胎座型。

In the flowering plants, an ovary is a part of the female reproductive organ of the flower or gynoecium. Specifically, it is the part of the pistil which holds the ovule(s) and is located above or below or at the point of connection with the base of the petals and sepals. The pistil may be made up of one carpel or of several fused carpels (e.g. tricarpel), and therefore the ovary can contain part of one carpel or parts of several fused carpels. Above the ovary is the style and the stigma, which is where the pollen lands and germinates to grow down through the style to the ovary, and, for each individual pollen grain, to fertilize one individual ovule. Some wind pollinated flowers have much reduced and modified ovaries.