Stems lenticellate or not; stems strigose or tomentose, often becoming glabrous. Leaves: petiole 8-15 mm long, glabrous or sparsely strigose; blade elliptic, oblong or weakly obovate, 4.5-15.5 by 1.7-8.5 cm, 1.2-3.5 times as long as wide, apex acuminate, base rounded or obtuse, rarely acute or weakly cordate, glabrous, sparsely strigose on midrib or tomentose beneath, 5-13 pairs of secondary veins. Inflorescence robust and lax, 4.6-19.5 cm long, strigose or tomentose; pedicels 6-17 mm long. Sepals 9-23 by 1.8-6.1 mm, 3.2-10 times as long as wide, narrowly ovate, tomentose; colleters few in sinuses or frequently absent. Corolla white or yellowish; tube 8.3-14 by 6 mm, 0.4-1.1 times as long as lobes, 0.6-0.9 times as long as calyx, tomentose or strigose outside, glabrous in throat, pubescent behind anthers inside; lobes obovate, falcate, apex flattened or rounded, sometimes with one corner acute or acuminate, 8.8-23 by 3.7-11.5 mm, 1.3-2.8 times as long as wide. Stamens inserted at 2.3-4.5 mm from corolla base which is 0.2-0.4 of tube length; anthers 4.7-7.5 by 1-1.6 mm, 3.3-6.1 times as long as wide. Disk narrower at top, 5-dentate; 1.1-3 mm long, 1.1-3.8 times as long as ovary. Ovaries 0.8-1.8 mm long; pubescent; style 1.9-3.5 mm long, sometimes pubescent; style head 2.2-3 mm long. Fruit unknown.
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