The vascular tissue in moncot root consists of six or more vascular bundles which are arranged in a ring just inner to the pericycle. The vascular bundles are radial i.e., xylem and phloem are situated at different radii. As the number of vascular bundle is more than six in monocots, the condition is known as polyarch. In dicot root the vascular bundles are 2 to 6 and this condition is called diarch to hexarch. In dicot stem the vascular bundles are conjoint, collateral and open and are arranged in a ring. In monocot stem the vascular bundles are conjoint, collateral, closed and are scattered.