erysinum cheiranthoides

from The Collaborative International Dictionary of English v.0.48

Wormseed \Worm"seed`\, n. (Bot.)
   Any one of several plants, as {Artemisia santonica}, and
   {Chenopodium anthelminticum}, whose seeds have the property
   of expelling worms from the stomach and intestines.
   [1913 Webster]

   {Wormseed mustard}, a slender, cruciferous plant ({Erysinum
      cheiranthoides}) having small lanceolate leaves.
      [1913 Webster]