closed vascular bundle

有限维管束(closed vascular bundle)。有些植物的原形成层完全分化为木质部和韧皮部，没有留存能继续分裂出新细胞的形成层。

bundle-英汉词典... ... closed bundle 有限维管束 closed vascular bundle 有限维管束,闭锁维管束 coherent bundle 相干光束 ...

... 封闭维管束 closed bundle 封闭维管束 closed vascular bundle;definite vascular bundle 封闭在蒴中的；被囊 encapsulated ...