CHELIDONIUM, CELANDINE, and HORNED or PRICKLY POPPY: A genus of the monogynia order, belonging to the pentandria class of plants; and in the natural method ranking under the 27th order, Rhedeas. The corolla is tetrapetalous, the calyx diphyllous, the filiqua unilocular and linear. There are six species, none of which are remarkable for their beauty; but one of them, viz. the majus, is an article in the materia medica. It grows on old walls, among rubbish, and in waste shady places. The herb is of a bluish green colour; the root of a deep red; and both contain a gold-coloured juice: their smell is disagreeable, the taste somewhat bitterish, very acrid, burning and biting the mouth; the root is the most acrid. The juice takes off warts; cures tetters, ring-worms, and the itch; and, diluted with milk, it consumes opaque white spots on the eye.—Horses, cows, goats, and swine, refuse to eat the herb.