*charlock*

n. [ AS. cerlic; the latter part perh. fr. AS. leác leek. Cf. Hemlock. ] (Bot.) A cruciferous plant (Brassica sinapistrum) with yellow flowers; wild mustard. It is troublesome in grain fields. Called also chardock, chardlock, chedlock, and kedlock. [ 1913 Webster ]

Jointed charlock,
White charlock, a troublesome weed (Raphanus Raphanistrum) with straw-colored, whitish, or purplish flowers, and jointed pods: wild radish. [ 1913 Webster ]