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This common evergreen bush trails over the ground or climbs over other vegetation. Its slender, straight thorns; doubly serrate leaves that are usually pinnately 3-5 foliolate (3-5 leaflets); that are about 1" across; flowers and oblong berries that are black when ripe. The fruit makes fine jam and jelly, and is an important food for fruit eating birds and some mammals. It is common from California to British Columbia.
Blackberry was planted along the creek path near private property in an effort to prevent people on the trail from going into residents yards. The blackberry has moved into the public area and become quite abundant throughout the creek.