boneset n European herb having small white, pink or purple flowers; naturalized as a weed in North America n perennial herb of southeastern United States having white-rayed flower heads; formerly used as in folk medicine Usage(s) Nonetheless, a demand persists for senna, henna, pennyroyal, hops, boneset, camomile, sage, tansy, flaxseed, rhubarb, ginger root, fennel seed, aniseed, saffron, viburnum. Synonym(s) common comfrey Symphytum officinale agueweed thoroughwort Eupatorium perfoliatum