Cress

n. pl. Cresses (krĕs"ĕz).
  1. A plant of various species, chiefly cruciferous. The leaves have a moderately pungent taste, and are used as a salad and antiscorbutic.
    2. Bitter cress .
    See under Bitter.
    Not worth a cress, or “not worth a kers.”
    a common old proverb, now turned into the meaningless “not worth a curse.”