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国产杜鹃花叶解剖与分类群
熊子仙; 杜青; 王启德;
云南师范大学生命科学系!云南昆明650092
摘要:
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
关键词:  杜鹃花属  叶解剖  中脉维管束  
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