Prestonia
(named in honour of C. Preston, M.D., a correspondent of Ray). SYNS. Exothostemon and Haemadictyon. ORD. Apocynaceae. A genus comprising about thirty species of tall, climbing, twining, hirsute, pubescent or glabrous, stove shrubs, natives of tropical America. Cymes often densely corymbose or almost umbelliform, pseudo-axillary, sessile or shortly pedunculate. Leaves opposite, penniveined. Perhaps the only species worthy of mention is the one here described. It should be grown in a stove, and potted in a light, loamy soil. It makes a pretty specimen when trained upon pillars or a balloon trellis. Propagated by cuttings, rooted under a bell glass, in bottom heat. P. venosa (veined). fl. yellowish-green, pale in the centre, in drooping racemes. June. l. lanceolate, glabrous, beautifully traversed by crimson veins. St. Vincent, 1821. SYN. Echites nutans (B. M. 2473).