摘要
该研究以中国产芸香科广义吴茱萸属18种3变种为材料,于体视显微镜下观察叶结构特征。结果发现:(1)吴茱萸属叶脉为羽状脉。(2)二级脉有花环状弓形脉和简单弓形脉两种类型,极少数存在内二级脉,间二级脉存在或缺失。(3)三级脉不规则网状或极少数弱贯穿,边缘三级脉环状。(4)四级脉不规则网状或自由分支。(5)五级脉不规则网状或自由分支,脉间区发育差或中等,游离端小脉末端简单或管状异形,边缘末级脉大多数不完整,极少数环状。(6)基于重要的外部形态学特征和叶结构特征观察结果,编制了广义吴茱萸属植物的分组检索表。研究表明,吴茱萸属这些类群的二级脉与更高级脉序形成的结构极为稳定,同时又存在种间差异,故广义吴茱萸属植物叶结构特征可以为更准确地鉴定一些疑难种和混淆种提供佐证,具有重要的系统分类学价值。
Leaf architecture of 18 species and 3 varieties of Euodia s.l.(Rutaceae)in China was observed under a stereomicroscope.The primary vein framework is pinnate venation pattern.In most species,the secondary veins are festooned brochidodromous and simple brochidodromous.Very few species are present interior secondaries.Intersecondary veins are absent or present.Tertiary veins are irregularly reticulate or very few weakly percurrent,with marginal tertiary veins being annular.Quaternary veins are irregular reticulate.Quinternary veins are irregular reticulate or freely ramifying.Areolation is poor or moderate developed.Freely ending veinlets of most species are simple or tracheoid idioblasts.Marginal ultimate veins in most species are incomplete,and a few are annular.A key to the sections of Euodia s.l.is presented mainly based on some important external morphological features and leaf architecture characteristics.The results show that the structures formed by the secondary veins and higher veins of these Euodia groups are very stable at the genus level,and there are some interspecific differences.Therefore,the leaf architecture characteristics of Evodia could provide evidences for more accurate identification of some difficult and confused species,which have important taxonomic significance.
作者
曹明
曹丽敏
曹小燕
李象钦
CAO Ming;CAO Limin;CAO Xiaoyan;LI Xiangqin(Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin,Guangxi 541006, China;2College of Life Sciences and Environment, Hengyang Normal University, Hengyang, Hu'nan 421008, China;3Hu'nan Key Laboratory for Conservation and Utilization of Biological Resources in the Nanyue Mountainous Region, Hengyang, Hu'nan 421008, China)
出处
《西北植物学报》
CAS
CSCD
北大核心
2022年第3期410-417,共8页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金(31360038)。
关键词
芸香科
吴茱萸属
叶结构
分类学意义
Rutaceae
Euodia
leaf architecture
taxonomic significance
