1 (Also called)
wild mustard a weedy cruciferous Eurasian plant, Sinapsis arvensis (or Brassica kaber), with hairy stems and foliage and yellow flowers
2 ♦
white charlock (Also called)
wild radish, runch a cruciferous plant, Raphanus raphanistrum, with yellow, mauve, or white flowers and podlike fruits
(Old English cerlic, of obscure origin)