Abstract: 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 imper-fect in development but small in size, however, in Cylindrokelupha, 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 al-most medium in size.

Key words: Albizia