TACHIADENUS (from Tachia, a genus of the same order, and aden, a gland; the ovary is surrounded by a ring of glands, as in Tachia). ORD. Gentianeae. A genus including five species of stove herbs or sub-shrubs, endemic in Madagascar. Flowers pink or white, sometimes violet with a white tube, large, few in a terminal cyme, or solitary; calyx tubular, multi-glandular within, five-cleft at apex, five-keeled or five-winged; corolla salver-shaped or funnel-like, with a long tube and five spreading, twisted lobes; stamens five. Leaves sessile or stalked, often three-nerved. Only one species has been introduced. It thrives in a mixture of sand, loam, and peat, and requires to be kept rather dry in winter. Propagated by cuttings, inserted in sand, under a hand glass, in heat. TACHIADENUS carinatus (keeled).* fl., calyx 2/3in. long, the obverse wings half-lanceolate, the lobes linear; corolla tube white, 2in. long, swollen at apex, the lobes violet, rounded, obtuse, less than 1in. Long; cyme terminal, twice dichotomous. October. l. oval, sessile, three-nerved. Stem suffruticose, tetragonal. 1858. (B. M. 5094.)