A group of yellow charlock.
charlock definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a weed (Brassica kaber) of the crucifer family, with yellow flowers
Origin: Middle English cherlok ; from Old English cerlic
charlock definition by American Heritage Dictionary
An annual weed (Sinapis arvensis) in the mustard family, native to Eurasia and naturalized in North America, having racemes of yellow flowers and hairy stems and foliage.
Origin: Middle English cherlok, from Old English cerlic.