Branchlets glabrous, internodes 3/4–1 1/2 in. long. Leaves opposite, ovate, acute at the apex, subcordate at the base, 1 1/2 in. long, 1 in. broad or less, very thinly coriaceous, glabrous; lateral nerves about 2 on each side, oblique, slightly raised on both surfaces, the upper pair running subparallel to the midrib; petiole about 4 lin. long. Umbels 4-flowered; peduncle 1 1/2–2 lin. long; pedicels 1/2 lin. long; bract obliquely cupular, distinctly umbonate, dorsal margin 3/4 lin. long, ventral margin 3/8 lin. long. Receptacle and calyx together campanulate with a very wide mouth, 2 lin. long. Calyx truncate, ciliolate, 1 lin. long. Corolla 1 3/4–2 in. long, glabrous outside, apical swelling in bud ellipsoid-oblong, truncate, nearly 2 lin. long, basal swelling ellipsoid, 2 1/2 lin. long; tube split unilaterally; lobes reflexed, spathulate, 3 1/2 lin. long, upper enlarged part 2 lin. long, 3/4 lin. broad. Filaments inserted about 1/2 lin. below the base of the corolla-lobes, 2 1/2 lin. long, tapering upwards, tooth 3/8 lin. long; anthers narrowly oblong, 1 1/8–1 1/4 lin. long. Disc distinctly lobed, 1/4 lin. high. Style skittle-shaped above, thickened part 3 1/4–3 1/2 lin. long, neck 1 1/8 lin. long.
