Petiole 1.4-10 cm, rust-brown villous; leaf blade oblique, elliptic to elliptic-ovate, 7.5-8.5 X 5-6 cm, adaxially rust-brown pubescent, abaxially rust-brown pubescent along midrib and lateral veins, base sometimes oblique, rounded to cuneate on 1 side, rounded on other, margin irregularly dentate, apex broadly acute to obtuse; lateral veins abaxially conspicuous. Cymes ca. 3-flowered; peduncle ca. 8 cm, rust-brown pubescent; bracts subulate to lanceolate, 3-4 mm. Pedicel 1.1-1.4 cm. Calyx actinomorphic, 5-sect from base; segments equal, linear-lanceolate, 5-6 X ca. 1.5 mm, outside rust-brown pubescent. Corolla white, inside blackish near mouth, outside sparsely white puberulent, inside with small scales; tube ca. 3 mm; adaxial lip ca. 3.5 mm, distinctly 2-lobed; abaxial lip ca. 4 mm. Filaments ca. 1 mm, puberulent; anthers broadly ellipsoid, ca. 3 mm, beaked ca. 0.5 mm; staminodes 3. Pistil ca. 5.5 mm; ovary ca. 2.5 mm, minutely villous. Style glabrous. Fruit unknown. Fl. Aug.
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