It has leaf primordia and a shoot apex.
叶特化成为具有锋利尖端的结构。
At the appearance of the eighth leaf primordia, SAM formed a bulge and had more cells.
至第八对叶原基产生后，茎端分生组织才稍微隆起，细胞数目增多。
The procambium continuously develop to the apex after it arises from the place where the leaf primordia originates from below the apical meristem.
原形成层在顶端分生组织之下叶原基起源的地方发生。
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