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根和根冠被一鞘状结构，即胚根鞘所覆盖。
Both root and root cap are covered by a sheath-like structure called the coleorhiza.
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形态结构类叶升麻根尖由根冠和顶端分生组织构成；
Anatomical Structures of ActaeaRoot: root tip is consisted of initial cells of calyptrogen, periblem and plerome;
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