扁穗苔属植物硅酸体系统及其系统分类学的研究

The studies on phytolith system and classification of Blysmocarex (Cyperaceae)

以国产莎草科扁穗苔属 ( Blysmocarex cyperaceae)分布区内 30个居群硅酸体系统分析结果 ,结合植物形态学和植物生态地理学特征 ,深入探讨了广义的大花扁穗苔复合种 ( Blysmocarex macrantha complex)内类群系统演化与生境地理之间的关系。认为大花扁穗苔由 3个近缘的水平地理替代亚种构成 :subsp.macrantha、subsp.nudicarpa( Y.C.Yang) D.S.Deng、subsp.stolonifera( Wang ex Li) D.S.Deng;在地理空间上此三者具有较为明显的水平地理空间替代性。同时 ,认为 Ivanova( 1 939)

According to the phytolith system analysis of 30 populations in the genus Blysmocarex which comprizes Blysmocarex macrantha complex species only,and combined with the characteristics of plant morphology and eco-geography,the author concluded that the species formed by three geographical subspecies: (1)Subsp. macrantha,with flattened elliptic-orbicular nuts,flat leaf blades and a distribution of Gansu,Qinghai,Tibet,Sichuan and India,Nepal,Buthan,Sikkim,Pamir; (2)Subsp. nudicarpa (Y. C. Yang) D. S. Deng,with flattened orbicular or lentiform nuts,flat leaf blades and a distribution of S Qinghai,NW Sichuan and NE Tibet,its glumes and prophylls are fugacious; (3)Subsp. stolonifera (Wang ex Li) D. S. Deng,with oblong or cylindric nuts,filiform leaf blades and a distribution of Qinghai and Tibet. And,the author supports the opinion of Ivanova who subdivided the genus Kobresia and established her new genus Blysmocarex that related to Kobresia early.