Dracaena stem

The Dracaena stem shown here, contains a number of scattered vascular bundles towards the central region of the stem, as well as vascular bundles arranged within what appears to be secondary, predominantly parenchymatous tissue. Dracaena and a few other genera such as Cordyline, Beaucarnea (=Nolina) are anomalous  because they have secondary growth from a secondary thickening meristem (STM). This is irrespective of the fibres around the bundles as this occurs in both those with an STM and those without an STM.