木兰属叶片的比较解剖学研究

对木兰属（Magnolia)12种、1亚种植物的叶片进行了比较解剖学研究。结果表明：（1）Nootboom系统的云南木兰（M.yunnanensis)和乐东木兰（M.lotungensis)的叶肉中含有大量的单宁,与木兰属其他植物叶片的解剖结构有较大区别,支持刘玉壶系统^[2]拟单性木兰属（Parakmeria)的建立;（2）凹叶厚朴（M.officinalis ssp.biloba)为厚朴（M.officinalis)的亚种,二者下表皮均被表皮毛,但表皮毛的细胞个数明显不同,因而很易区分;（3）木兰属植物的叶片在叶片厚度、栅栏组织和海绵组织厚度的比例、表皮毛、油细胞大小及其分布密度密度等方面在种间具有一定差别。

Comparative Anatomy on Leaves in Magnolia

This paper is to study the comparative anatomy on leaves of 12 species and one subspecies.The result is:(1) The anatomical structure of leaves in Magnolia is different from that of Parakmeria,the latter has a large amount of tannin cells in their palisade tissue,which is in accordance with Liu Yuhu's theory of foundation of Parakmeria;(2)There is a kind of structure similar to "wrist" in the epidermical hairs of M.officinalis ssp.biloba and M.officinalis,but the number of cells from the hair base to the "wrist" is different,the former has 2 to 3 cells,while the latter has only one;(3) There is also difference between species in the thickness of leaves,the percentage of palisade tissue and spongy tissue,epidermical hairs,the size and distribusive density of oil cells and etc.,which can provide experimental basis on leaf anatomy for differentiating species.