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.