国产合欢属和棋子豆属的叶结构及其分类学意义

本文通过对国产合欢属Albizia 15种及棋子豆属Cylindrokelupha的叶结构观察,发现此两属叶结构特征有明显的区别,是较好的属间区别性状,表现在合欢属(3)4级以上脉至盲脉完全被厚壁的维管柱鞘细胞深深包埋,为包埋脉,且这些包埋脉宽度相等,不逐级递减,不易辨别,多分枝;网眼较小,发育不完善,不易辨别;而棋子豆属则表现为4级以上脉逐级递减,不为较厚的厚壁细胞的维管柱鞘细胞包埋,易于辨别,网眼接近中等大小,易辨。此外,还提供了国产合欢属15种,棋子豆属8种叶结构分析的基础资料,并就其在分类上的意义作了一些探讨。

THE LEAF ARCHITECTURE AND ITS TAXONOMIC SIGNIFICANCE IN THE GENERA ALBIZIA AND CYLINDROKELUPHA FROM CHINA

This paper had provided the fundamental information about the leaf architecture of 15 species in Albizia and 8 species in Cylindrokelupha from China, and discussed the taxonomic significance of the leaf architecture. It was found that it is quite different in leaf architecture between these two genera, so it is a good taxonomic feature for them. It showes mainly that in Albizia, quatenary (sometimes tertiary) and above veins to veinlets are well-distributed, many-branched and not proportional reduction in width from one order to the next, but are embedded by the sclerenchyma, and in the meantime the areolae are imperfect in development but small in size, however, in Cvlindrokelupha, quaternary and above veins to veinlets are well-distributed but distinguishable from one order to the next and not embedded by the sclerenchyma, and in the meantime the areolae are distinguishable but almost medium in size.