摘要
广西南部植物区系位于北回归线以南，蕨类植物非常丰富，现已发现５４科、１４１属、５８４种。科、属组成以水龙骨科Ｐｏｌｙｐｏｄｉａｃｅａｅ、金星蕨科Ｔｈｅｌｙｐｔｅｒｉｄａｃｅａｅ、蹄盖蕨科Ａｔｈｙｒｉａｃｅａｅ、鳞毛蕨科Ｄｒｙｏｐｔｅｒｉｏｄａｃｅａｅ四科的属、种成员最多，其中金星蕨科在植物区系中占有重要的位置，是本区系的一个特点；蹄盖蕨属、耳蕨属种类较少是本区系不同于鳞毛蕨－耳蕨植物区系的一个重要特征。区系地理成分复杂多样，属可划分为１２种类型（变型），种可划分为１５种类型（变型）。特有现象明显，中国特有１２７种，占２１．７４％；广西特有２６种，占４．４５％。本区系具有明显的热带性，同时也具有强烈的热带南亚热带过渡性，热带分布属占８３．６８％，热带分布种占６０．６２％。亚洲热带分布及其变型占有较大的比例，表明本区系与亚洲热带植物区系特别是中南半岛区系有密切的亲缘关系。
Southern Guangxi pteridophyte flora which located at south of the Tropic of Cancer is very rich in families, genera and species,584 species represented 141 genera and 54 families are found in the area. Polypodiaceae, Thelypteridaceae, Athyriaceae and Dryopteriodaceae are very important families in flora. There are less species in genera Athyrium,Polystichum unlike flora of westsouthern of China. The types of pteridophytic area pattern are very rich also, the genera and species area pattern are divided into 12 types and 15 types respectively.The obvious endemic phenomena is another characteristic, 127 Chinese endemic species including 26 endemic species of Guangxi are found. This flora has close affinity with tropical ones and is transitional flora from the tropical to the south subtropical,in which the tropical area patterns of genera are 8368% and of species 6062%. The fact which Asian tropical area patterns are very important indicates the flora studied here has close affinity with tropical Asian especially with Indochina flora.
