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Leaves 4.4–8.5 × 1.6–4 cm, elliptic, acuminate at the apex, the actual tip sometimes narrowly rounded, cuneate at the base, thin, glabrous above, with hairy domatia in the main nerve axils and sparse long setae beneath; petioles 5–13 mm long, glabrous or sparsely setose; stipules 5 × 1 mm, linear-triangular to oblong, rather thick, ± acute; nodes bristly within.
Corolla yellow or greenish-yellow; tube 4.5 mm long, 3 mm wide at the base and apex, 3.75 mm wide at the middle, glabrous outside, with a ring of deflexed bristles 1 mm long inside; lobes 5, 5–6 × 1.5 mm, linear-triangular, acuminate, sparsely to densely pilose outside.
Inflorescences axillary, opposite, several-to many-flowered, the branches ± bifariously shortly pubescent; peduncles 5 mm long; secondary peduncles up to 10 mm long; bracts and bracteoles 2–5 × 0.5–1.5 mm, oblong-oblanceolate; true pedicels 1–2 mm long.
Calyx tube 2 mm long and wide, subglobose to turbinate; lobes 4–5, 6–15 × (2)4.7–6 mm, ovate to lanceolate, acuminate, narrowed and often with colleters at the base, leaf-like, nervose, sparsely to densely pubescent and ciliate.
Fruits about 3–3.5 × 2.5 cm, subglobose, glabrous and a little shining, angular and wrinkled when dry.
Small tree or shrub 2–6 m tall, with grey-brown rugulose glabrous lenticellate branchlets.
Style 7.5–9 mm long, narrowed towards the apex.
Pollen presenter 1.1 mm long, cylindrical.
Pyrenes about 2.5 cm long, sharply keeled.
Ovary 5-locular.
