特殊用法amphitropous ovule1.横生胚珠anatropous ovule1.倒生胚珠antitropal ovule1.直生胚珠atropous ovule1.直生胚珠apotropous ovule1.下转胚珠campylotropousovule1.弯生胚珠epitropous ovule1.上转胚珠marginal ovule1.边缘胚珠primordial ovule1.原卵