Stems with internodes 0.2-5 cm. Petiole 0.7-2 cm; leaf blade usually falcate, lanceolate, 4-13 X 1.1-4.5 cm, adaxially sparsely appressed puberulent, abaxially sparsely puberulent along veins, margin indistinctly denticulate, apex acuminate; lateral veins 6-8 on each side of midrib. Peduncle 1.5-4 cm, glabrous; bracts deciduous, white, ca. 1.5 X 1.3 cm. Calyx white; segments obovate to oblong, 0.9-1.2 cm X 3-6 mm, outside glandular pubescent to glabrous, apex rounded, rarely emarginate. Corolla white to yellowish, ca. 4-5 cm, outside puberulent to glabrous, 2.5-3.5 X 1-1.5 cm; adaxial lobes rounded, ca. 5 mm; abaxial lip 1.3-1.5 cm, lobes suborbicular, central lobe 8-10 mm, lateral lobes ca. 5 mm. Adaxial stamens ca. 1 cm, abaxial ones ca. 1.4 cm; staminode ca. 1.2 mm. Pistil 2.2-2.6 cm, glabrous to glandular puberulent. Capsule 6-8 cm. Seed appendages ca. 0.5 mm. Fl. Jul-Oct, fr. Oct.
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