中国蓼属头状蓼组植物叶表皮微形态及其分类学意义

采用光学显微镜对中国蓼属头状蓼组17种7变种植物的叶片下表皮微形态进行了观察研究,结果表明,其叶片下表皮微形态特征分为4种类型:(1)气孔器类型为无规则型,表皮细胞不规则形,垂周壁波状或深波状;(2)非典型不等型,偶有无规则型,表皮细胞多边形或不规则形,垂周壁弓形、波状或深波状;(3)平列型,表皮细胞不规则形,垂周壁深波状;(4)平列型兼有非典型不等型,表皮细胞不规则形,垂周壁波状。根据其叶片下表皮气孔器类型,结合该组植物形态、习性等特征,将中国蓼属头状蓼组植物划分为4个系,即掌裂叶系、多年生系、蓼子草系以及一年生直立系。

Micro-morphology of Leaf Epidermis and Its Taxonomical Significance of Polygonum Section Cephalophilon in China

The leaf lower epidermal characters of 17 species and 7 varieties of Polygonum sect.Cephalophilon in China were observed under light microscope(LM).Four main types of leaf lower epidermal micro-morphology could be recognized in the present paper:(1)The stomata are anomocytic;the shape of the leaf epidermal cells is irregular,and the anticlinal walls undulate or sinuate;(2)The stomata are non-typical anisocytic,rarely anomocytic;the shape of the leaf epidermal cells is polygonal or irregular,and the anticlinal walls straight,undulate to sinuate;(3)The stomata are paracytic;the shape of the epidermal cells is irregular,and the anticlinal walls sinuate;(4)The stomata are paracytic and non-typical anisocy-tic;the shape of the epidermal cells is irregular,and the anticlinal walls undulate.A new viewpoint of four new series which are series Palmatifolia,series Perennes,series Criopolitana,series Annui was proposed in this paper on the basis of the evidences from stomata type of leaf lower epidermis as well as gross morphology and habits.