The process is restricted to certain angiosperms but a primitive form is known from some gymnosperms.
The process is restricted to certain angiosperms but a primitive form is known from some gymnosperms.
此过程仅限于某些被子植物，但从裸子植物中也发现了一些较原始的形式。
The process is restricted to certain angiosperms but a primitive form is known from some gymnosperms.
此过程仅限于某些被子植物，但从裸子植物中也发现了一些较原始的形式。