• 1. primary xylem: 初生木质部 | 原生木质部
• 2. primary y xylem: 初生木质部

• 1.Primary xylem xylem derived from the procambium in the young plant.
  初生木质部：指幼嫩植物中来源于原形成层的木质部。
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• 2.At the upper and the middle part of hypocotyl, the pith appears, and the order of the primary xylem differentiation is endarch.
  在下胚轴中、上部，髓部开始出现，初生木质部分化顺序为内始式；
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• 3.The extending cotyledon traces differentiate directly from the parenchymatous cells which locate on the outside of the poles of primary xylem.
  伸向子叶的子叶迹，直接由原生木质部极外面的一群薄壁组织细胞分化形成。
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