中国伞形科东俄芹属果实表面微形态特征及分类学意义

采用扫描电镜方法对中国伞形科东俄芹属果实表面微形态特征进行了比较观察。根据果实外表面的纹饰类型、凸起程度和表面蜡质分泌物等特征,可将它们划分为三种不同的类型:(1)皱纹型;(2)皱纹-不规则疣状突起型;(3)皱纹-近圆形或多边形突起型。其微形态特征在属下种间表现出丰富的多样性,可为种的划分和属间演化关系的探讨提供重要的分类学依据。

Micromorphological features of pericarp surface of Tongoloa(Apiaceae)in China and its taxonomic significance

In this paper,the pericarp surface ornamentation of ten species of Tongoloa Wolff in China were examined under SEM for the first time. The results indicate that the ornamentation variation of pericarp surfaces is obvious at interspecies level. Based on the comparison of pericarp surface characteristics of these species,rugose,rugulous-colliculate-rectangular and rugulous-irregular-tuberculate types are distinguished. Rugose and rugulous-colliculate-rectangular are all characterized by invisible outline of cell of the pericarp surfaces,but the type of ornamentation at the former is lack or sparseness striate,which shows lineate at the later. Rugulous-irregular-tuberculate appears the shape of cell of the pericarp surfaces,which is often subconical or polygonal with striate or reticulate ornamentation. These micromorphological features are evaluated as possible consistent parameters in the delimitation of species of Tongoloa Wolff.