Shrub to 1 m. or so; branchlets slightly compressed to 4-angular, then terete, glabrous, ± densely lenticellate. Leaves alternate to opposite; petiole to 2(–4) mm. long; lamina thinly coriaceous, dark green, sometimes red-veined, elliptic-lanceolate to ovate-elliptic, 4–10 cm. long, 2.5–6 cm. wide, subacute to obtuse or shortly rounded at the apex, broadly cuneate to rounded at the base, glabrous, rather inconspicuously penninerved with lower pair of nerves stronger and ascending to upper half. Flowers clustered in axils and at older nodes below, subsessile; bract cupular with a small triangular limb, 2.5–3 mm. long, ciliolate. Receptacle 1–1.5 mm. long; calyx slightly funnel-shaped, 2–2.5 mm. long, subtruncate, ciliolate. Corolla (3.5–)4–5 cm. long, with yellow-orange tube banded green and orange-red at top, lobes paler pinkish white over vents, with red to purple tips; apical swelling of bud slight, oblong, 6 mm. long, 1.5 mm. in diameter; basal swelling 5–6 mm. long, 2.5–3 mm. in diameter, with tube narrowly constricted for 4–6 mm. above; lobes erect, 8–9 mm. long, with the upper two-thirds linear-oblanceolate, slightly keeled and slightly hardened inside. Filaments red, slender, involute, scarcely corrugated, but apical 0.5–0.7 mm. smooth, pale, hardened; anthers 2–2.5 mm. long. Style green, slender; stigma ovoid-conic, 0.8–1 mm. long. Berry not seen.