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的维管束间的具有旺盛分裂能力的一层胞。

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

、柄、上胚轴的维管束为外韧型。

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

主发达，有胞组成的维管束鞘，具双生韧皮部。