植物区系成分 floral element，这是植物地理学上的术语，指构成某地区植物区系的植物种中，其分布圈、分布过程等同一起源的植物群。
青冈林植物区系成分复杂，具有较高的热带成分比例。
The community has a high diversity of family, genus and species, and a great variety of plants whose composition is complex.
植物区系成分的研究，为合理开发、利用、保护当地植物资源，开展科学引种提供了充分的依据。
The study of floristic element has supplied sufficient basis for developing, utilizing and preventing the local plant resources, as well as developing plant introduction from other basin or areas.
中生代，广东植物区系成分发生了很大的变化，裸子植物大量繁盛，但总体上是在本区晚古生代华夏植物区系的基础上演化而来的。
In Mesozoic, Guangdong flora had a big change, the gymnosperm was prosperous, but it was evolved from the late Paleozoic Cathaysian flora as a whole.
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