五、散生竹类各分类群的维管束特征单轴型与复轴型地下茎,长期以来被分为两大类型,是竹类系统分类据点之一。但这两个类型从其维管束解剖形态来看,并没有明显的区别,它们都同样具开放型与半开放型的典型维管束,(只有方竹属Chimonobambusa的个别种例外),毛竹属Phyllostachys虽然是单轴型的属,但我们也发现水竹Ph.heteroclada Oilv.桂竹Ph.bambusoides S.et Z.与台湾桂竹Ph.makinoi V. Vascular bundle characteristics of different taxonomic groups of unripe bamboo The uniaxial and complex shaft underground stems have been divided into two major types for a long time and are one of the classification points of bamboo system. However, there is no obvious difference between the two types in terms of their anatomic vascular bundles. Both of them have the same open and semi-open typical vascular bundles (only a few species of Chimonobambusa), Phyllostachys Although it is a uniaxial genus, we also found Ph.heteroclada Oilv. Ph.bambusoides S.et Z. and Ph.makinoi