马鞭草科9种植物叶表皮特征及其分类学意义

在生物数码显微镜下观察了马鞭草科6属9种植物的叶表皮形态。结果表明:所有植物上、下表皮均有腺毛;表皮细胞的垂周壁有平直和波状弯曲2种类型,其中假连翘属上、下表皮和马缨丹属上表皮的垂周壁较为平直,赪桐属、牡荆属、冬红属、豆腐柴属植物都呈不同程度的波状弯曲;该科植物气孔器以无规则为主,且气孔器由横列型、平列型向无规则型方向进化;三对节表皮毛和气孔器类型的独特性表明该种植物在赪桐属的地位具有特殊性;气孔密度和气孔指数在属间的分类意义不明显,但在属内种间的分类上具有一定价值。

Leaf Epidermal Characters of 9 Species in Verbenaceae and its Taxonomic Significance

The epidermal characters of mature leaves of 6 genera,9 species in Verbenaceae were examined by using digital microscope.The results showed that both upper and lower leaf epidermal cells of these species had trichome.There were two types of anticlineal wall in Verbenaceae,which were nearly straight and wave-shaped curve.The former type was seen in Duranta and upper leaf epidermal cells of Lantana.The anticlineal walls were wave-shaped curve type in Clerodendrum,Vitex,Holmskioldia and Premna.The stomata apparatuses were predominantly anomocytic and the evolutionary trend of the stomatal apparatuses was from diacytic type and paracytic type to anomocytic type.The patterns of epidermal hairs and stomata apparatus in C.serratum were peculiar indicating that the species had a specific status in the Clerodendrum taxonomy.The stomatal density and stomatal index had little taxonomical significance among the six genera.However,the two characters might be useful for species identification.