中国金缕梅科12属植物次生木质部的比较解剖

本文采用常规的木材解剖学方法，对我国金缕梅科(Hamamelidacea)5个亚科12属14种植物，进行了木材比较解剖学研究。结果表明，本科中最原始的是金缕梅亚科(Hamamelidaceae)的榴木属；最进化的是同亚科的蚊母树属和水丝梨属。这说明金缕梅亚科内部各属之间的进化程度并不一致。其它4个亚科中的7个属，进化程度处于榴木属和蚊母树属、水丝梨属之间。壳菜果和枫香树这两个亚科内，各自的属间进化程度较为一致。马蹄荷亚科与红花荷亚科均各只有一个属，它们的进化程度相对于金缕梅亚科的3个属来说，较为居中，且彼此也很相近。总的来说，除了金缕梅亚科内部各属进化程度差异较大以外，剩下的4个亚科进化程度都较为接近。在同一亚科内，属间木材结构有一定的差异，但程度有所不同。

COMPARATIVE ANATOMICAL STUDIES ON THE SECONDARY XYLEM OF TWELVE GENERA IN HAMAMELIDACEAE

The paper deals mainly with comparative studies on wood anatomy of 5 subfamilies of Hamamelidaceae. The wood features of wood of Hamamelidaceae are similar, but there are some differences between the genus. It can be observed that the pores of woods of Hamamelidaceae are entirely diffuse, well distributed without pattern. And the multiseriate rays of Hamamelidaceae are entirely heterogenous. A systematical study of the features of vessel elements, wood fibers and wood rays of Hamamelidaceae was carried out. The most original genera is Loropetalum of Hamamelidoideae, but the most evolved genera, Sycopsis and Distylium, are also parts of Hamamelidoideae. It indicates that the evolution of genera of Hamamelidoideae is not similar. There are 2 genera in Mytilarioideae and 3 genera in Liquidambaroideae. The genera in each of the two subfamilies are similar in the degree of evolution. Exbucklandioideae and Rhodoeioideae each have only one genera. The degree of evolution of the subfamilies is similar, Hamamelidoideae excepted. Genera of the same subfamily may be different in the structure of wood.