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Leaves rather glossy, opposite or ternate; blades (5)10–22 × (2)4.5–9.5 cm, oblong or ovate-oblong to narrowly oblong-obovate, acuminate-cuspidate at the apex, cuneate at the base, rather thin, sometimes slightly undulate at the margin; petiole 5–13 mm long; stipules 1–15 mm long, ovate or ovate-triangular, obtuse, membranous, joined together on one side.
Corolla white; tube 9–12.5 cm × 2.5–5 mm, enlarging to 10 mm wide at the throat which is hairy within; lobes 4–5.5(7) × 1.3–2 cm, broadly oblong, obtuse, pubescent at the base inside.
Calyx tube 15 × 4–5 mm, cylindric-fusiform, longitudinally ribbed; limb-tube 12–20 mm long; lobes 2.5–6.5 cm × 1.5–5 mm, linear-oblong, bluntly acute.
Glabrous shrub or small tree 1.8–6 m tall with somewhat angular young branchlets; older stems covered with longitudinally fissured bark.
Ovary with 3 placentas; style pilose; pollen presenter 5–6 mm long, broadly club-shaped, sulcate, shortly lobed at the apex.
Fruit 4–6 × 1.6–2.2 cm, fusiform, with 6 distinct corky ribs, crowned with the persistent calyx limb.
Seeds yellow-brown, compressed, 5–8 × 4–4.5 mm, finely reticulate and shagreened.
Flowers terminal, solitary on short thick pedicels to 8 mm long, 5–6-merous.
Anthers 2 cm long, partly exserted.
