Armatus

A safety epithet for a plant that defends itself with spines, thorns or prickles. Botanists keep the three apart — a thorn is a modified stem, a spine a modified leaf, a prickle a sharp outgrowth of the surface — and this epithet covers all of them without saying which. It is the direct opposite of inermis, "unarmed". Appears as armatus (masculine), armata (feminine), or armatum (neuter).