Branches terete, stout, 2–3 lin. in diam., glabrous, dark brown, densely lenticellate; internodes 1 1/2–2 1/2 in. long. Leaves opposite, ovate-lanceolate, rounded at apex and base, 4–5 1/2 in. long, 1 3/4–2 1/3 in. broad, coriaceous, glabrous, dull; principal lateral nerves 2 on each side, very oblique, distinctly raised, especially on the upper surface, the upper pair arising about 1/2 in. above the base, running subparallel to the midrib; petiole 5–6 lin. long. Umbels axillary, solitary, 2–4-flowered; peduncle 1–2 lin. long; pedicels 1–1 1/4 lin. long; bract obliquely cupular, dorsal margin 7/8 lin. long, ventral margin 7/16 lin. long. Receptacle and calyx together narrowly campanulate, 2 1/4 lin. long. Calyx ascending, truncate, 1 1/4 lin. long. Corolla over 1 3/4 in. long, truncate in bud, with an oblong apical swelling 2 lin. long, glabrous outside, basal swelling obovoid, 3–3 1/2 lin. long; tube split unilaterally; lobes reflexed, spathulate-linear, 4 lin. long. Filaments inserted 1/2 lin. below the base of the corolla-lobes, involute through one circle, tapering upwards, about 2 1/4 lin. long, tooth 3/8 lin. long; anthers narrowly oblong, 1 1/8 lin. long. Disc pentagonal, hardly lobed, 1/8– 1/6 lin. high. Style skittle-shaped above, thickened part 3 lin. long, neck 1 1/8 lin. long.
