中国海菜花属植物的性状分析

ANALYSES ON THE CHARACTERS OF THE GENUS OTTELIA (HYDROCHARITACEAE) IN CHINA

本文对中国海菜花属全部已知分类群的84个形态学、生物学和生态学性状,进行了R分析和主成分分析。R分析结果表明,被研究的性状可明显地划分为若干组高度相关的性状,它们或表明本属向次生性陆生和异花传粉方向演化,或具重要的分类价值。主成分分析结果表明,仅前16个主成分几乎可保留84个性状的全部信息量,这说明在中国海菜花属分类研究中所选性状很合理;前3个主成分可保留总信息量的76.56%,说明在三维空间内能较好地反映中国海菜花属所有已知分类群间的相对位置。

The present paper made a R cluster analysis and a Principal component analysis (PCA)on the 84 characters including morphotogical, biological and ecological ones of all the taxa of Ottelia so far known from China, R cluster analysis results showed thaa the characters studied could be obviously divided into several highly-related character groups which either suggested the genus tends to become secondarily terrestrial and highly cross-pollinated or were of great taxonomic importance, The results through PCA revealed that, ① only the first sixteen principal components comprise almost total information amount possessed by 84 characters, which indicates that the characters selected for classifying Chinese Ottelia are quite reasonable, and② merely the first three principal components accounts for 76.56% information amount of that possessed by all characters, which further means that in a tri-dimensional space the relative position among all the taxa of Chinese Ottelia could be depictured successfully.