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报道了怀牛膝根的三生生长。其初生结构和次生结构类似于一般双子叶植物根。根的加粗主要是由于三生结构的分化和发生。第一圈额外形成层起源于次生韧皮部外侧相当于中柱鞘部位的薄壁细胞。以后的每一圈由前一圈向外衍生的薄壁组织细胞产生。栽培牛膝根中，通常有离心分化的四圈三生维管束排成整齐的同心环类型，三生维管束由薄壁结合组织彼此分开。三生维管束的圈数随根的个体发育增加，但并非同步进行，在一段时间内有相对稳定期。表皮细胞反分化而行平周分裂形成木栓形成层。
Reported the growth of Achyranthes root health. Its primary structure and secondary structure similar to the general dicotyledonous roots. Root bold is mainly due to the differentiation and occurrence of the three living structures. The first lap additional cambium originated from the parenchyma in the outer portion of the secondary phloem that corresponds to the mid-scapular site. Each subsequent ring is derived from parenchyma cells derived from the previous round. Cultivation of Achyranthes root, there are usually three cycles of trigeminal vascular bundles of centrifugation arranged in neat concentric ring type, three-dimensional vascular bundles from the thin-walled tissue separated from each other. The number of loops of the three-dimensional vascular bundle increased with the individual development of the root, but not synchronized, with a relatively stable period of time. Epidermal cells reverse differentiation and perinuclear split forming cork formation layer.