cycads
英[siː'kædz]
美[siː'kædz]
名词 cycad:
-
any tropical gymnosperm of the order Cycadales; having unbranched stems with a crown of fernlike leaves
- Genus of small evergreen tropical and subtropocal American cycads.
一种小的常绿热带和亚热带美洲苏铁。
- Cycads and ginkgo have motile sperm, unlike gnetophytes and conifers, which produce pollen.
苏铁和银杏具活动精子可区别于买麻藤和松柏类，它们不产生花粉。
