Thorns are actually modified leaves, stipules (small leaf-like appendages at the base of a leaf), or even branches that have become hardened and pointed for protection.
Here are some examples of plants with thorns:
* Roses: The classic example!
* Hawthorn: A thorny shrub with red berries.
* Blackberry: The stems are covered in sharp thorns.
* Cactus: The spiky structures on a cactus are actually modified thorns.
While some plants use thorns for defense against herbivores, others use them for climbing support.
