heterotropous ovule

• 横生胚珠

heterotropous ovule的用法和样例：

例句

1. The ovule is unitegmic,tenuinucellate and anatropous.
   薄珠心，单珠被，倒生胚珠，蓼型胚囊。
2. Frequently the basal ovule, which is the last one to be fertilized would abort.
   最后受精的基生胚珠经常败育。