湖南五加科植物区系的初步研究

湖南五加科植物共有14属,44种(含变种)。分别占全国总属、种数的60.9％和20.8％。其中较原始的多蕊木族Pler an dreae中的属种数目占优势,同时又有较强烈的分化和一定的特有现象,说明湖南既保存有五加科的始生环境又是一个新的分化地区。地理成分分析表明。属的成份是以含种数不多的热带——亚热带成份为主;种的成份可分为东亚型,华夏型等8个类型。是以含种数较多的亚热带——温带成份为主。这种属、种地理成不尽一致的特点。说明了湖南五加科植物区系是自南岭山地和云贵高原隆起之后,由亚热带——亚热带区系迅速演化成现已属泛北极植物区性质的亚热带——温带山地植物区系。这说明湖南五加科植物区系与西南及邻近其他省区都有一定程度的联系,其中与西南地区尤其是云南省联系最为密切,可能由其演化而来。

Preliminary Study on Acanthopan Family Plant Flora in Hunan

Hunan has 14 genera, 44 species all tosether, occupies 60.9% and 20.8% of all nation's genera and species respectively. Among which, the genera and species of compara- tive primitive Plerandreae holds an advantageous place. Geoglaphy componant analysis shows, genera componant mainly contains warm--subwarm zone componant, species can be divided into 8 type such as east--Asia type, Huaxia type, mainly contains subwarm--temperate componant. This shows, of Hunan has certuin retation with Southeast district and its neighbour provinces and areas especially with Yunan.