URCEOLA, a lately discovered genus of the pentandra class, and monogynia order of plants, ranking immediately after TABERNÆ MONTANA (see Encycl.), and consequently belonging to the 30th natural order or class called Contorta by Linnæus in his natural method of arrangement. One of the qualities of the plants of this order is their yielding, on being cut, a juice which is generally milky, and for the most part deemed of a poisonous nature. The genus is thus characterised by Dr. Roxburgh: Galyx beneath five-toothed; corol one petaled, pitcher shaped, with its contracted mouth five toothed: nectary entire, surrounding the germa; follicles two, round, drupaceous; seeds numerous, immersed in pulp. There is but one known species, which is thus described by the same eminent botanist: