But the structural feature and the arrangement of vascular bundles at the abaxial end of the mature leaf petiole of the same species are similar to those of the leaf blade base, which are relatively stable.

• 但在同一品种的成熟叶叶柄远轴端与叶片基部相接处的结构特征和维管束排列形状常相同,比较稳定。