Radial vascular bundles and collateral vascular bundles are two types of arrangements of vascular tissue in plants.
Radial vascular bundles are found in the roots and stems of some plants, such as ferns, and have vascular tissue arranged in a circular pattern, with the xylem and phloem alternating around the center.
Collateral vascular bundles are found in most dicotyledonous plants and some monocotyledonous plants. They have vascular tissue arranged in two distinct areas, with the xylem located towards the inside of the bundle and the phloem located towards the outside. This arrangement is often referred to as a “two-lobed” structure.
The key difference between radial and collateral vascular bundles is in their arrangement of vascular tissue. Radial bundles have a circular arrangement, while collateral bundles have a two-lobed arrangement. Additionally, radial bundles are typically found in the roots and stems of primitive plants, while collateral bundles are found in most dicots and some monocots.
