广西植物区系的特有现象

ENDEMISM IN THE FLORA OF GUANGXI

本文统计了广西植物区系的特有属和特有种．分析了广西植物区系的特有现象．结果表明．广西植物区系有中国种子植物特有属６１个．占中国种子植物特有属总数的２３．７％；其中广西本地特有属１２个．特有程度仅次于有１５个省级特有属的云南。广西植物区系共有６９６个被子植物特有种．隶属于１０４科２８５属．它们有着强烈的热带亚热带性质．石灰岩山地的特有化发展则是广西植物区系的另一个显著特征，在６９６个特有种中．有２３０种为石灰岩山地专性特有种。这种石灰岩的特有化发展在苦苣苔科中表现得尤为显著。

Endemism in the Flora of Guangxi is surveyed and analyzed. The result shows thatGuangxi is rich in endemics. 61 Senera of seed plants endemic to China are found in the region, of which 12 are indigenous. The degree of endemism of Guangxi flora is thehishest next to Yunnan which has 15 indigenous endemic genera. The 12 genera endemicto Guangxi are Heteroplexis、Brachiostemvn、Rhaphiocarpus、Buxiphyllum、Gyrogyne、Allostigma、Dayavshania、Dolicholoma、Metabriggsia、Schistolobos、Pseudochirita and Dendrocalamopsis.The flora of Guangxi is also abundant in endemic species amounting to 696 speciesand belonging to 285 genera and 105 families. They tend to be strongly tropical and subtropical in nature, and were likely to originate from the local regions.Endemism developed in the limestone regions of Guangxi shows a remarkable feature. of the 696 endemic species, 230 are exclusively distributed in the limestone regions.This phenomenon is conspicuous,in Gesneriaceae and Sect. Chrysantha Chang ofTheaceac.