Thorns are modified stems/branches. Obviously, hungry consumers would hesitate before eating this plant because in doing so, they would risk injury. Thorns are a great protective mechanism for stationary plants. They are made from vascular tissue and can be found at nodes (as shown in the photo). Thorns can sometimes be confused with spines (modified leaves) and prickles (outgrowth of epidermis, does not contain vascular tissue). A very common misconception is that roses have thorns. Those spiky projections on the stems of roses are actually prickles.