A large number of vascular bundles. A limited number of vascular bundles. The vascular bundles are scattered in the ground tissue. The vascular bundles are arranged in a ring. No cambium occurs between the xylem and phloem.
Cambium occurs between the xylem and phloem.
There is no distinction between the cortex and pith. The cortex and pith can be clearly distinguish. No Secondary thickening. Secondary thickening can occur. No annual rings are formed.