中国4种水韭植物叶片分类学特征的比较观察

我国共有5种水韭，全部被列为国家一级保护，均属极度濒危级（CR）野生植物。就营养器官而言，因水韭根、茎的简化，叶片特征成为最重要的分类学依据。本文针对形态特征相近的中华水韭、云贵水韭、台湾水韭和东方水韭，用显微镜观察了叶片发育的形态特征。结果表明：不同种水韭叶片在旋转角度、气孔分布等方面存在差异，而气孔器的种间一致性较高；同种水韭叶片在不同发育时期，其近远轴面的气孔指数、气孔分布及叶凸指数均有稳定的分类价值。本文检索讨论了我国4种水韭的分类学关系，并发现了叶表皮都存在异形条状细胞。

Comparative Observation on the Characteristics of Leaves of Four Species in Chinese Isoetaceae

There are five species of Isoetes in China, all of them are the first-grade state protection plants at the most endangered level (CR) of wild plants. From vegetative organ speaking, blade features become the most important basis for classification because of the simplified roots and stem in Isoetes. Because the height and leaf number of Isoetes hypsophila are significantly different from the others, the leaves epidermis of Isoetes sinensis, I.yunguiensis, I.taiwanensis and I.orientalis were observed by optical microscope. The results indicated that the rotation angle and pore distribution area are different, stomatal apparatus have upper uniformity; In different development periods, the stomatal index, pore distribution, height ratio of adaxial leaf surface and abaxial leaf surface have obvious taxonomy values, which provide a new basis for interspecific identification of Isoetes. In addition, this paper discussed the classification relationship in four Chinese Isoetes and first reported the heteroideus long strip cells.