The characteristic features of vascular bundles of dicot stem are as follows:

$4.$ Vascular bundles are arranged in a ring.

$5.$ They are conjoint, i.e., xylem and phloem are present on the same radius.

$6.$ They are open, i.e., a cambium layer is found between xylem and phloem.

$7.$ They are not surrounded by bundle sheath.

The position of protoxylem is towards the centre, i.e.,endarch.