Shrub to 2 m tall. Branches sparsely lenticellate; glabrous. Leaves opposite; petiole 2-20 mm long, glabrous; blade thin, elliptic, 2.7-20.5 by 1-6.5 cm, 2-4 times as long as wide, apex acuminate, base cuneate, glabrous above and beneath, 4-16 pairs of secondary veins, arcuate ascending, tertiary venation obscure. Inflorescence 2.5-18 cm long, glabrous; peduncle 1-3 cm long; pedicels 5-25 mm long. Sepals often leafy, often quite variable in size even within a single flower, mostly narrower at the base than at the middle, 3-14 by 1.3-4 mm, 2-7.7 times as long as wide, apex obtuse or rounded, not ciliate. Corolla with an ovoid bud head which is 0.2-0.4 of bud length, apex acute; tube 7.7-22 by 1.5-1.9 mm, 2.1-3.2 times as long as calyx, 1.8-1.9 times as long as lobes, twisted or not; lobes 6.5-20 by 2.8-8 mm, 2.3-4 times as long as wide; glabrous outside and inside or pubescent around stamen insertion. Stamens inserted around the middle or upper half of corolla tube; anthers 2-3 by 0.5-0.8 mm. Ovaries 1 mm long; style and style head 5-12.5 mm long. Fruit shortly stipitate, 3.8-5 by 0.8-2.3 cm, apex acuminate, sometimes torulose, several-seeded. Seeds ovoid, 7 by 4.5 mm.
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