Branchlets subangular to angular, thick, 8-10 mm diam., sulcate when dried, smooth, not lenticellate, glabrous, with conspicuous leaf scars. Leaves in whorls of 4-6(-7), coriaceous to thickly so when dried, long petiolate; petiole 2-5.5 cm long, glabrous; blades usually narrowly obovate, sometimes obovate or elliptic, 14-29 by 5.5-10.1 cm, ratio 2-3.1, base cuneate, margin entire, sometimes rather undulate, apex abruptly acuminate, rarely rounded; secondary veins conspicuous, rather prominent, 12-19 pairs, 0.5-2.1 cm spaced, at an angle of 50-80(-90)° from midrib, arcuate ascending, not reaching the margin, rarely joining, not forming a submarginal vein; tertiary veins not prominent, conspicuous on abaxial side only, reticulate. Inflorescence 9.5-18.5 cm long, terminal and axillary cymes, in whorls of 2-5, congested, glabrous; peduncle 6.5-12.5 cm long, glabrous. Flowers more than 30 on each inflorescence, fairly long pedicellate; pedicels 3 mm long, glabrous. Sepals suborbicular to orbicular, 2.1 by 2.1 mm, ratio 1, margin entire to undulate, apex blunt, rather thin except at the middle-basal part, rather rough outside, smooth inside, glabrous, connate at base for 0.6 mm. Corolla in mature buds narrowly ellipsoid, 20 by 2-2.5 mm, ratio 8-10, of which the lobes form a rounded apex, glabrous outside, villose inside, sparse, forming a belt of 3 mm wide just around the insertion of stamens; tube cylindrical, 10 mm long, tube-calyx ratio 4.8, tube-lobes ratio 0.8, straight; lobes narrowly elliptic, 12-12.5 by 3 mm, ratio 4-4.2, margin entire, apex rounded, glabrous, auriculate on the left side at base. Stamens inserted at 8 mm below the mouth, 0.2 of the length of the corolla tube; anthers ovate to narrowly so, 1.5 by 0.5 mm, sagittate at base, apex acute, yellowish when dried; filaments filiform, 1 mm long. Ovary ovoid, widening at base, apex rounded and abruptly narrowed at base of style, 1 by 1 mm, of 2 distinctly separated carpels. Style filiform, 3.7 mm long, style-ovary ratio 3.7, not split at base.
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