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

脉、柄、上胚轴的维管束均为外韧型。

Actinostele A rype of protostele in which the xylem is star shaped and the phloem lies between the points of the star.

原生中柱的一种类型。木质是星形的，韧皮星形之间。