Description from Flora of China
Trees, 3-12 m tall; branches with internodes congested to developed, compressed to terete, densely puberulent to glabrous, resinous at apices with usually distalmost several internodes coated with dried resin, becoming straw-brown. Leaves opposite; petiole 0.2-1 cm, puberulent to glabrous; blade drying thinly leathery, bright to dull or yellowed green adaxially, similar but darker or paler abaxially, obovate-oblong, elliptic-oblong, or oblanceolate, 5-19.5 × 2-8 cm, adaxially shiny and glabrous, abaxially glabrous to puberulent, base cuneate to acute, apex acute or shortly acuminate with tip often ultimately obtuse; secondary veins 10-15 pairs, in abaxial axils with pilosulous domatia; stipules calyptrate, conical, 4-10 mm, splitting for 1/2-3/4 their length, puberulent to usually glabrous. Flowers solitary, terminal or pseudoaxillary; peduncle 0.4-0.8 cm, densely puberulent. Calyx puberulent, usually covered with resin; ovary portion broadly obconical to ellipsoid, 5-ridged, 5-6 mm; limb with tubular portion 3-4 mm; lobes 5, oblong-lanceolate to linear or spatulate, 4-7 mm, 1-1.6 mm wide at base, strongly keeled, narrowed then ultimately rounded at apex. Corolla outside apparently glabrous, often covered with resin; tube ca. 15 mm, somewhat funnelform; lobes 5, obovate-oblong to elliptic, 23-30 × 8-10 mm, acute to obtuse and apiculate. Fruiting peduncles to 2 cm. Berry yellow, subglobose or ovoid-ellipsoid to ellipsoid, 1.6-3.3 × 1.5-1.6 cm, with 5 weak to developed longitudinal ridges, with persistent calyx limb. Fl. Apr, fr. May-Oct.
● Forests at streamsides in valleys or on mountain slopes; below 100-1200 m. Guangxi (Shangsi), Hainan.