There is a layer of compressed cells in the secondary structure of stem.
在茎的次生结构中皮层与韧皮部之间有一层扁平形细胞；
Describe the difference of secondary structure between root and stem.
简述根与茎次生结构的区别？
The secondary structure of annual stem of 6 genera (12 species) from Magnoliaceae of China is described.
利用滑走切片技术和显微镜的手段观察了木兰科一年生茎的次生结构特征。
Results and Conclusion The secondary structure of the stem of Uvaria microcarpa consisted of the periderm, cortex and vascular cylinder.
结果与结论紫玉盘的茎次生构造由周皮、皮层及维管组织组成；
Results and Conclusion The secondary structure of the stem of Uvaria microcarpa consisted of the periderm, cortex and vascular cylinder.
结果与结论紫玉盘的茎次生构造由周皮、皮层及维管组织组成；
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