||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.