茎的初生维管束中有3大束和5～7小束，两个大维管束之间夹有2～3个小维管束，所有维管束在茎的横切面上呈环状排列；

There were 3 big vascular bundles and 5~7 small vascular bundles in young stem, and there were 2~3 small vascular bundles between two big vascular bundles, they were all arranged in circularity.

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茎的初生结构中多个维管束排列成环状，节部为单隙三迹，叶迹分别来自于3条维管束或同一条维管束。

The vascular bundles of the primary structure in stem are ring arranged, and the node is unilacunar and 3-traced, which is from three vascular bundles or one vascular bundle.

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是初生木质部的内，外方都有初生韧皮部分布的一种维管束排列方式。

Bicollateral bundle the arrangement of tissues in the vascular bundles in which the phloem is situated on both sides of the xylem.

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