The characteristic features of vascular bundles of dicot stem are as follows: (i) Vascular bundles are arranged in a ring. (ii) They are conjoint, i.e., xylem and phloem are present on the same radius. (iii) They are open, i.e., a cambium layer is found between xylem and phloem. (iv) They are not surrounded by bundle sheath. (v) The position of protoxylem is towards the centre, i.e., endarch.