Armed. Bearings thorns, spines, or prickles:
Thorn. A stiffy, woody, modified stem with a sharp point; sometimes applied to any structure resembling a true thorn.
Spine. The hard and sharply-pointed tip of a branch or leaf, usually round in cross section.
Prickle. A sharp-pointed outgrowth from the epidermis or cortex of any organ.
Unarmed. Lacking spines, prickles, or thorns.