初生韧皮部：指幼嫩植物中来源于原形成层的韧皮部。
Primary phloem PHLOEM 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。
Primary xylem xylem derived from the procambium in the young plant.
中柱包括从原形成层衍生而来的全部初生组织，由中柱鞘、韧质部和木质部组成。
The stele includes all primary tissues derived from the procambium consists of pericycle, phloem and xylem .
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