福建柃属植物叶片脉序的比较研究

观察了福建柃属18种1变型植物的叶脉特征.结果表明,柃属脉序主要为环节曲行羽状脉;一级脉纤细至中等粗细,近直行,一级脉的差别较小;二级脉夹角多为锐角,也有直角或钝角;二级间脉有简单型和复合型两种;三级脉为结网型,叶缘末级脉有结环型、不完全型;网眼大小、形状不规则,发育均为不完善型.且这些性状稳定,表明柃属植物的脉序具有分类学价值,亦可为柃属的系统学研究提供一些有用的资料.

Comparative Study on the Venation about Eurya in Fujian

The leaf venational patterns of 18 species and 1 variation of Eurya in Fujian were observed.The result shows that the Eurya leaf venations are brochidodromous; the primary veins are weak to moderate,straight;there is little differences between the primary veins; the secondary veins' angle of divergence are mostly acute,also right-angle or obtuse;intersecondary veins are simple and compound;tertiary veins are reticulate,at the margin,veinlets are forming into a loop or incomplete;areole has not a norm in shape and area,it is imperfect in system development .These distinctive characteristics are steady,which indicates that the leaf venationals of Eurya have significance for the delimitation of species,also provides additional evidence for systematics of Eurya.