合欢种皮侧缘厚壁(薄壁)细胞层中有维管束，它为种皮的发育提供水分与营养。
The vascular bundles in stereid layer or Parechymatous cell layer of lateral margin of its testa provide the testa development with water and nutrition.
此外，两个种的维管束结构及叶缘结构等也有很大的差异。
The structures of vascular bundle and leaf margin were also different.
此外，两个种的维管束结构及叶缘结构等也有很大的差异。
The structures of vascular bundle and leaf margin were also different.
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