charlock

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Related to runch: crunch, ranch

charlock:

see mustardmustard,
common name for the Cruciferae, or Brassicaceae, a large family chiefly of herbs of north temperate regions. The easily distinguished flowers of the Cruciferae have four petals arranged diagonally ("cruciform") and alternating with the four sepals.
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charlock

1. a weedy Eurasian plant, Sinapis arvensis (or Brassica kaber), with hairy stems and foliage and yellow flowers: family: Brassicaceae (crucifers)
2. white charlock a related plant, Raphanus raphanistrum, with yellow, mauve, or white flowers and podlike fruits
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005