Vascular bundles of dicot stem areI.   Radial     II.  Collateral     III. Open     IV. Endarch

Vascular bundles of dicot stem are collateral, open and endarch type as they have xylem with phloem side by side in the same radius with cambium between them in which the protoxylem is towards the centre. Hence the vascular bundles are collateral, open and endarch type. Radial vascular bundles are seen in roots.