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；
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；
At the upper and the middle part of hypocotyl, the pith appears, and the order of the primary xylem differentiation is endarch.
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