国产杜鹃花叶解剖与分类群

报道了分别隶属于杜鹃花属 ( Rhododendron)中 8个亚属的国产 33个种叶片的解剖特征。根据中脉维管束结构特点 :木质部与韧皮部的位置 ,木质部的形状 ,木射线排列的方式 ,可分为 5个类型 :( 1)圆形周韧维管束 ;( 2 )羽线肾形周韧维管束 ;( 3)扇线肾形周韧维管束 ;( 4 )近周韧维管束 ;( 5)下韧维管束。讨论了中脉维管束类型可能的演化趋势 :周韧维管束→近周韧维管束→下韧维管束。还讨论了 8个亚属中脉维管束所处的演化阶段

Taxon and anatomy of leaves in Rhododendron from China

This paper deals with leaf anatomy of 33 species in eight subgenus of Rhododendron from China .According to the arrangement of phloem and xylem, shape of xylem and the Arranging way of xylem rays, the midrib bundles were divided into five forms :(1) amphicribral round bundle; (2) pinnate ray amphicribral reniform bundle; (3) fan ray amphicribral reniform bundle; (4) almost amphicribral bundle; (5) collateral bundle. The midrib bundles have be found with follow possible evolutionary trends: amphicribral bundle almost amphicriral bundle collateral bundle. Consequently the evolutionary stage of the midrib bundle of eight subgnus was discussed.