Spiny plants are a type of plant that have sharp spines or thorns to protect themselves from predators. Two examples of spiny plants are CACTI and aloes, both of which have five letters in their names. CACTI are succulent plants that are native to the Americas and are known for their thick stems and spines. Aloes are a type of succulent plant that is native to Africa and the Arabian Peninsula and are characterized by their spiny leaves.