The vascular bundle consists of vascular bundle sheath, xylem, phloem and big parenchymatous cells.
维管束由维管束鞘、木质部、韧皮部和大型薄壁细胞组成。
Bicollateral bundle the arrangement of tissues in the vascular bundles in which the phloem is situated on both sides of the xylem.
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。
There are some sclerenchymatous cells outside the phloem of each vascular bundle to increase the supporting force of the petiole.
每个维管束的韧皮部外面有数层厚壁细胞，增加叶柄的机械支持作用。
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