The Collaborative International Dictionary
Artemisia santonica
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.
Wormseed mustard, a slender, cruciferous plant ( Erysinum cheiranthoides) having small lanceolate leaves.