Branchlets glabrous to sparsely puberulent. Leaves: petiole 3-6 mm long, sparsely pubescent; blade elliptic, 3.8-11.8 by 1.6-5.6 cm, 1.8-3.8 times as long as wide, apex acuminate, base cuneate, 8-11 pairs of secondary veins, tertiary venation reticulate, sparsely puberulent on midrib to sparsely pubescent all over above, sparsely puberulent on midrib and secondary veins to densely rusty pubescent all over beneath. Inflorescence terminal, 2.5-6 cm long; peduncle 0.2-0.8 cm long, sparsely to densely pubescent; pedicels 4.3-9.5 mm long, sparsely to densely pubescent. Sepals ovate, 2.8-5 by 2.2-3 mm, 1.2-1.8 times as long as wide, apex obtuse to rounded and slightly reflexed or not, margins slightly reflexed, sparsely to densely pubescent, colleters large and wide in sinuses. Corolla tube 3.6-6 mm long, 1.2-1.5 times as long as sepals, 0.5-0.7 times as long as lobes, minutely pubescent at top of tube outside, glabrous to sparsely puberulent inside; lobes 6.7-11 by 2.8-4.7 mm, 1.8-2.8 times as long as wide, elliptic, apex obtuse; antipetalous corona lobes 3.5-5.2 mm long, dentate at apex, adnate to corolla lobe for most of length, glabrous inside, 1.3-2.6 times as long as alternipetalous lobes; alternipetalous corona lobes 1.5-3 mm long, narrow, bifid; alternating lobes lacking. Stamens inserted at 0.7-0.9 of tube length from base, strongly exserted from tube; filament 1 mm long; anthers 5.6-6.6 by 1.3-1.7 mm, densely pubescent outside. Gynoecium of 2 adnate carpels, ovary 1.3-2 mm high, glabrous; style and style head 6.7-8.2 mm long. Fruit of connate follicles, splitting into 2 at dehiscence, 6.6-29.5 by 1.2-1.6 cm (see note), glabrous, lenticellate or not. Seeds 12.3-17 by 1.3-2.3 mm; coma 3.2-4.7 cm long.
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