Herb
Any seed-bearing plant which does not have a woody stem and dies down to the ground after flowering.
Tree
Perennial plant with an elongated stem, or trunk, supporting branches and leaves in most species.
Shrub
Particular physical structural or plant life-form of woody plants which are less than (26 ft) high and usually have many stems arising at or near the base.
Vine
A plant whose stem requires support and which climbs by tendrils or twining or creeps along the ground