以上来源于: WordNet
In woody plants, tissues outside of the vascular cambium.
木本植物维管形成层外部的组织。
Study of the Transition from Procambium to Vascular cambium in Erythrina Arborescens Roxb.
原形成层向维管形成层转化的研究。
Results identified that the adventitious root primordia originated from the vascular cambium cells.
结果表明：试管苗不定根的根原基发生于形成层。
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