维管束的

Interfascicular cambium A single layer of actively dividing cells between the vascular bundles in stems.

束间形成层是位于茎束间具有旺盛分一层细胞。

The micrib belonging to bicollateral bundle is well developed.The bundle sheath is composed of idioblasts.

主脉发达，有异细胞组成束鞘，具双生韧皮部。

The development of xylem is of mesarch.Stomata are monocyclic type.

叶脉、叶柄、上胚轴束均为外韧型。