Branchlets brownish, finely lenticellate, glabrous; internodes about 1 3/4 in. long. Leaves opposite or subopposite, ovate-elliptic, obtuse or rounded at the apex, cordate at the base, 3–4 in. long, 2–2 3/4 in. broad, thinly coriaceous, glabrous; lateral nerves about 3 on each side, arcuate-ascending, anastomosing far from the margin, slightly raised on both surfaces; petiole about 3 lin. long. Umbels axillary, solitary or geminate, 4-flowered; peduncle 1 1/2 lin. long, flattened at the apex between the sockets; pedicels about 1/2 lin. long; bract obliquely cupular, dorsal margin 7/8–1 lin. long, ventral margin 1/2 lin. long. Receptacle and calyx together narrowly campanulate, 1 7/8–2 lin. long. Calyx 1 lin. long. Corolla 1 1/2–1 2/3 in. long in bud, apical swelling oblong, rounded-subtruncate, obtusely pentagonal, 1 5/8 lin. long, 1 1/4 lin. in diam., basal swelling obovoid, 2 1/2 lin. long; tube eventually split unilaterally about 8 lin. down; lobes reflexed, spathulate, acute, about 3 1/2 lin. long. Filaments tapering slightly upwards, 2 1/2 lin. long, tooth 1/3 lin. long; anthers oblong, slightly emarginate, 7/8 lin. long. Style skittle-shaped above, thickened part 2 3/4 lin. long, broadest below the middle, neck about 1/2 lin. long; stigma oblong-obovoid, 1/2 lin. long.
