Leuchtenbergia
(named after Prince Leuchtenberg). ORD. Cacteae. A monotypic genus, the species being a greenhouse succulent. Flowers produced at the top of the plant, among the younger mamillae, very like those of Cereus, but having a more cylindrical perianth tube, and the stamens growing to its inside as far as the bottom of the petals, after which they converge and meet in the centre, closing up the mouth of the tube. The species, like most other succulents, require careful watering. For general culture, see Mamillaria. L. principis (princely). fl. rich clear yellow, large, usually solitary, produced near the axils of the tubercles. l. glaucous green, succulent, 4in. or 5in. long, triangular, truncated at the apex, and there bearing six or seven long chaffy, or almost horny linear, or subulate flexuose scales, of which the centre one is almost as long as the mamillae, and the others form a whorl round the centre. Stem about as thick as a man's arm, hard and woody, covered with the remains of decayed mamillae. Mexico, 1847. (B. M. 4393.)