TORDYLUM, in botany, a genus of the pentandria digynia class. The radii of the corolla are all hermaphrodites; the fruit is roundish, with a crenated edge; and the involucre are long, and undivided. There are seven species, only two of them natives of Britain, viz. the latifolium, or purple-flowered great bastard parsley; and the nodosum, or knotted parsley.