ROSE-WORT, in botany: A genus of the octandria order, belonging to the dioecia class of plants; and in the natural method ranking under the 13th order, Succulentae. The male calyx is quadrupartite; the corolla tetrapetalous. The female calyx is quadrupartite, and there is no corolla; the nectaria are four; the pistils four; and there are four polyspermous capsules. There are two species, the rosea and the minor: the first grows naturally in the clefts of the rocks and rugged mountains of Wales, Yorkshire, and Westmoreland. It has a very thick fleshy root, which when cut or bruised sends out an odour like roses. It has thick succulent stalks, like those of orpine, about nine inches long, closely garnished with thick succulent leaves indented at the top. The stalk is terminated by a cluster of yellowish herbaceous flowers, which have an agreeable scent, but are of short continuance. The second sort is a native of the Alps, and has purplish flowers which come out later than the former; it is also of a smaller size. Both species are easily propagated by parting their roots; and require a shady situation, and dry undunged soil. The fragrance of the first species, however, is greatly diminished by cultivation.

OIL OF RHODIUM. See ASPALATHUS.