%wormseed%

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 ]