Young branchlets terete, smooth, dirty orange-yellow, glabrous, very slightly glossy, the uppermost internodes 1–1 1/2 lin. in diam. at the middle, older branches 1/4– 1/2 in. in diam., bark dark grey, longitudinally cracked; nodes much swollen, internodes 1–5 in. long. Leaves opposite, sessile, ovate-oblong or elliptic-oblong, rounded at apex and base, 3 1/4–6 in. long, 1 1/2–3 1/4 in. broad, rigidly coriaceous, glabrous, upper surface slightly glossy, lower surface dull; lateral nerves rather oblique, 4–5 on each side of the midrib, slightly raised on the upper surface, hardly visible on the lower. Umbels 12–18-flowered; peduncle about 1/2 in. long; pedicels 1–1 1/4 lin. long; bract ovate-cupular, dorsal margin 3/4 lin. long, ventral margin 3/8 lin. long. Receptacle and calyx together subcylindric, the former 3/4 lin. long. Calyx cupular, 7/8 lin. long, shortly and irregularly 4-lobed; lobes subtruncate or emarginate. Corolla rounded at the apex in bud, carmine-red; petals narrowly linear, 1 1/4–1 1/2 in. long, 3/8 lin. broad near the middle, 1/2– 5/8 lin. broad near the base, ventral flap inserted about 1 1/2 lin. above the base, 1/4– 3/8 lin. long, emarginate or subtruncate. Stamens inserted 8–8 1/2 lin. above the base of the petals; filaments linear; 5 lin. long, grooved; anthers very narrowly linear, 2–3 lin. long. Disc 1/8– 1/6 lin. high.
