Charlock n. (Bot.) A cruciferous plant (Brassica sinapistrum) with yellow flowers; wild mustard. It is troublesome in grain fields. Called also chardock, chardlock, chedlock, and kedlock.
Jointed charlock, White charlock, a troublesome weed (Raphanus Raphanistrum) with straw-colored, whitish, or purplish flowers, and jointed pods: wild radish.
... above the shingle. There was a heat haze hanging over the smooth blue sea, so that sky and water merged into each other imperceptibly. In front of them, they could see the white cliffs of Boveyhayne shining in the descending sun. There were great stalks of charlock, standing out of the grass on the face of the cliffs, ... — Changing Winds - A Novel • St. John G. Ervine