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Leaves petiolate; petioles glabrous or less often pubescent, 1–7 mm. long; lamina membraneous when dry, variable in shape and size 2–4(5) times as long as wide, 4–26 x 1·5–12 cm., acuminate and sometimes with a blunt tip at the apex, symmetric or asymmetric and cuneate, rounded, or subcordate at the base, if asymmetric often cuneate on one and rounded or subcordate on the other side, entire, glabrous, with a few hairs, or less often pubescent on both surfaces; secondary veins 8–15 on each side, arcuate and anastomosing with each other and with the reticulate tertiary venation.
Corolla in the mature bud about 10 mm. long, of which the lobes are about 1/4 and do not shape a head, glabrous or puberulous and then with a glabrous base outside, inside hirto-pubescent between and often just below the anthers and above sometimes puberulous; tube 2·5–7 times as long as the sepals, 8–10 m. long, slightly constricted at 4–4·5 mm. and there 2–3 mm. wide and above gradually widened towards the throat and there 6–9 mm. wide; lobes subcircular, 3–6 x 3·5–6 mm., rounded, entire.
Sepals connate at the base, 1–1·7 times as long as wide, 1·5–3·5 x 1·3–2·4 mm. triangular or ovate, acuminate or acute, imbricate in bud, erect, glabrous, puberulous or pubescent outside, with 0–3 colleters above the base inside near both edges or occasionally with 7 colleters in a single row at the same level (the number may vary within a single flower from 0–3), ciliate or ciliolate.
Follicles yellow or pale orange or less often green outside, pod-like, recurved or straight, 2–7 times as long as wide, 3–6 x 0·8–1 cm., acuminate at the apex, rounded or cuneate at the base, smooth when fresh, indented around the seeds only when dry, dehiscent throughout by an adaxial longitudinal slit and then becoming flat and up to 7·5 x 2·5 cm.
Pistil 4·5–5 mm. long; ovary 2–2·5 x 1·5–2 x 0·8–1·5 mm.; disk entire, 0·3–1 mm. high; style split at the base often for even more than half its length, cylindrical, 1·2–1·5 mm. long; clavuncula ring 1–1·2 mm. in diam., and head 0·8 mm. in diam., stigma-lobes 0·2–0·4 mm. long and about 0·02–0·04 mm. thick.
Stamens inserted 2·8–3·5 mm. above the corolla-base; anthers sessile (even lower half of connective connate with the corolla tube by a cushion), 3·4–3·7 x 1·2–1·5 mm., with a sterile apex.
Branches pale grey-brown, lenticellate, with shallowly longitudinally fissured bark; branchlets glabrous or pubescent, sulcate when dry, lenticellate.
Seeds in 2 irregular rows, pale brown, laterally compressed, 5·5–6 x 4–4·5 x 2·5–3 mm., flat at one side, minutely pustulate; embryo straight, white.
Peduncle very thin, 1·5–7 cm. long, glabrous or less often sparsely pubescent as both branches and pedicels.
Inflorescences pendulous, 4–17 x 3–10 cm., 2–4 times branched, partly more or less dichasial.
Bracts minute, sepal-like, without or with a few axillary colleters leaving large leaf-scars.
Ovules c. 30 in 4 rows on one oblong placenta in each cell.
Pedicels thin, 5–20 mm. long, thickened at the apex.
Trunk 20 cm. in diam. (teste Robson 1657).
Shrub or small tree 1–5 m. high.
