大花的进化和相关的专门授粉机制可以通过一个花粉亲本对所有胚珠授粉来增加多排卵子房内种子的遗传相关性，从而最大限度地减少通过亲缘选择在发育中的种子之间竞争的影响。 使用系统发育独立性状数据， 拿吧 等. 在花的大小和种子数之间显示出很强的相关进化。
被子植物似乎分为两类：具有专门传粉者和许多种子果实的大花，如臭鸢尾 Iris foetidissima（鸢尾科），以及由通才昆虫或风授粉的小花和单一或少数种子果实，如假所罗门的印章， Maianthemum racemosum (Asparagaceae)。
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