华北地区繁缕属（Stellaria L.）植物叶表皮微形态特征研究

采用光学显微镜，对华北地区分布的繁缕属植物16种2变种，其它4属4种植物的叶表皮微形态进行了观察。结果表明：繁缕属植物叶片的下表皮均存在气孔器，而上表皮仅少数种类缺乏气孔器。气孔器类型比较多样，有不等细胞型、无规则型、无规则四细胞型；表皮细胞主要为不规则型，垂周壁从平直、弓形、浅波状、波状、到深波状；上表皮气孔指数在5.23~31.65之间；下表皮气孔指数在10.02~29.44。叶表皮被毛或无，毛被分为星状毛、腺柔毛、柔毛、绢毛。该研究说明叶表皮的微形态特征在种间差异明显，可以为分种及属间亲缘关系的探讨提供依据，但是对组的划分存在一定的局限性。

Micromorphology of Leaf Epidermis of Stellaria L. in North China

The leaf epidermis of 16 species and 2 variations belonging to Stellaria L. and other 4 species belonging to other 4 genera from North China were observed usder light microscopy. The results show that the stomata apparatus are found on abaxial epidermis in all species, most of species also have stomata apparatus on adaxial epidermis. The types including anisocytic, anomocytic and anomotetracytic stomata apparatus; The shape of cell is mostly irregular, with straight, arched, sinuate or sinuolate anticlinal walls; Stomata index of adaxial epidermis is 5.23-31.65, which is 10.02-29.44 on abaxial epidermis. The type of hair on leaf epidermis includes stellate, glandular pubescent, hair or lanate. The study indicates that the difference of micromorphology of leaf epidermis between species is obscure, it can provide some proves for species classification and the discussion of relationship between genera. However, it has some limitation in section classification.