Psychotria luxurians Rusby

Trees or shrubs to 25 m tall, the branches terete, smooth, glabrous, distinctly hollow, often constricted below the nodes, the latter well spaced, the branchlets ultimately subplane. Leaves oblong, often widely so, elliptic, 8.6-24.5 cm long, 3.2-15.0 cm wide, tapering obtusely or deltoidly at the apex, acuminate, occa-sionally inequilateral, the costa prominulous above, prominent or subplane be-neath, to 0.22 cm wide proximally, the lateral veins 10-18, arcuate, prominulous and often evanescent above, prominent beneath, the intervenal areas with smaller pinnatiform veins, papyraceous, usually discolorous, glabrous above, often pu-berulent on the veins and the costa beneath; petioles to 4 cm long, to 0.2 cm wide, usually glabrous, occasionally puberulent; stipules free, oblong or oblong rotund, often compressed and wider than long, 5-7 mm long, 3.7-8.0 mm wide, obtuse, rounded, often undulate or vaguely retuse, appressed setose within. In-florescences terminal, shorter than or exceeding the terminal leaves, to 22 cm long, paniculate, usually pyramidal paniculate; peduncle 1-6 cm long, 0.1-0.4 cm wide, subplane, angular, puberulent, the lowermost branches opposite, to 7 cm long, usually arcuate ascending or perpendicular, the axis with several paniculate branches, ultimately bearing densely flowered cymules; bracts of the primary branches linear oblong or subulate, to 5 mm long; hypanthium and calycine cup to 1.5 mm long, the calycine cup ca. 0.5 mm long, carnose, glabrous, the teeth widely deltoid, unequal, to 0.5 mm long, usually with a minute gland at the junction of 2 teeth; corolla tube cylindrical, to 3 mm long, glabrous outside, the lobes 5, ca. 1 mm long, villose within; stamens 5, the anthers ca. 1 mm long,