Stems 50-100 cm, densely velutinous. Leaves unequal in each pair; petiole 1-7 cm; leaf blade ovate, 11-27(-30) X 6-16(-19) cm, adaxially densely appressed pubescent, abaxially velutinous, base slightly oblique, broadly cuneate to rounded, margin serrulate, apex acute to abruptly acuminate. Peduncle 3-9(-12) cm, velutinous; bracts early deciduous, ovate, to 1.5 cm, densely puberulent. Calyx 0.9-1.1 cm; adaxial central lobe broadly ovate, ca. 2 X 3 mm, other lobes depressed deltoid, ca. 1 X 2.5 mm. Corolla 3.2-4.3 cm; tube 2.5-3 cm; adaxial lip ca. 4 mm; abaxial lip 0.9-1.2 cm. Stamens ca. 1-1.3 cm; central staminode ca. 0.2 mm, laterals 4.5-5 mm. Pistil 2.4-2.9 cm; gynophore 5-8 mm; ovary ca. 1.2 cm, glandular puberulent. Style glandular puberulent; adaxial stigma narrowly ovoid, ca. 1 mm, abaxial stigma obtrapeziform, ca. 2.5 mm, apex emarginate. Capsule 3-4.5 cm.
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