Pentagonia
(from pente, five, and gonia, and angle; referring to the divisions of the corolla). ORD. Rubiaceae. A genus comprising about eight species of stove shrubs, natives of tropical America. Flowers yellow, red, or greenish, large, but inconspicuous when compared with the foliage, in dense, axillary corymbs, sessile or nearly so; calyx with a turbinate, sub-cylindrical, or campanulate tube, and a spathaceous, or five or six-lobed limb; corolla funnel-shaped or tubular, thickly coriaceous, the limb of five or six valvate lobes. Leaves large, opposite, coriaceous, entire or pinnatifid, with large stipules. Branchlets thick, terete. For culture of P. Wendlandi--the only species yet introduced--see Cinchona.
P. Wendlandi (Wendland's). fl. yellow, produced in clusters from the axils of the upper leaves; corolla tubular-sub-urceolate. July. l. very shortly petiolate, coriaceous, obovate-lanceolate, slightly acute, rounded at base, some of them 1 1/2ft. long; petioles thick, naked. h. 2ft. 1861. (B. M. 5230.)