Lafazin “cankerweed” suna ne da ke nufin wani nau’in ciyawa ko tsiro wanda aka sanshi da ɗaci da saurin yaɗuwa. Yana cikin zuriyar Erysimum na dangin Brassicaceae. Itacen yana da furanni masu launin rawaya da ƙananan ganye masu siffar lance. Kalmar “cankerweed” na iya nufin duk wata tsiro da aka yi imanin tana haifar da ciwon daji, nau’in cuta ce da ke haifar da buɗaɗɗen raunuka a kan tushe da rassan bishiyoyi da tsirrai.