It'shows two well - developed sheaths around the vascular bundles.

它显示出两个发育完全之维管束鞘位于维管束周围.

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It'shows one sheath around the vascular bundles.

它显示出在维管束周围的鞘状构造.

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Interfascicular cambium A single layer of actively dividing cells between the vascular bundles in stems.

束间形成层:束间形成层是位于茎的维管束间的具有旺盛分裂能力的一层细胞.

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