Description from Flora of China
Perennials. Rhizome apical internodes to 2.2 cm. Stem absent, or decumbent, to 25 X 3 cm, puberulent. Leaves basal or crowded at apex of stem, opposite; petiole 0.5-11 X 0.2-1.5 cm; leaf blade sometimes oblique, narrowly elliptic to oblong, obovate, or ovate, 3-23 X 1.5-13 cm, herbaceous to papery, adaxially sparsely puberulent and sparsely pilose, eglandular, abaxially sparsely pubescent, base sometimes oblique, cuneate to attenuate and decurrent, seldom truncate-cordate, margin entire to indistinctly denticulate, apex acute to obtuse; lateral veins 4-7 on each side of midrib, inconspicuous. Cymes 2-15-flowered; peduncle 4.4-21 cm, puberulent to spreading pilose and glandular puberulent; bracts 2, free, elliptic to ovate or narrowly triangular, 0.9-25 X 0.2-9 mm, pubescent, margin entire, apex acute to acuminate. Pedicel (0.3-)1.5-6 cm, puberulent to spreading pilose. Calyx 5-sect from or near base; segments equal, linear-lanceolate to narrowly triangular, 0.7-1.7 cm X 0.5-1.2 mm, outside sparsely to densely puberulent and glandular puberulent, inside puberulent, margin entire, apex acute to attenuate. Corolla purplish to white with a purple spot below adaxial lip, 3-4 cm, outside sparsely puberulent to puberulent, inside glandular or puberulent on adaxial lip; tube nearly tubular, 2.4-2.8 X 0.8-1.2 cm; adaxial lip 3-5 mm; abaxial lip 7-12 mm. Filaments ca. 1 cm, sparsely puberulent; anthers fused by entire adaxial surfaces, 2.2-3 mm, glabrous; staminodes 2 or 3, 3-4 mm. Pistil 2-2.6 cm, puberulent and glandular puberulent; ovary ca. 1.2 cm. Stigma cuneate to narrowly oblong, 2-4 mm, 2-lobed or undivided. Capsule erect, 4.5-9 cm. Fl. Apr-Oct, fr. May-Oct.
* Rocky streamsides in forested valleys; 400-600 m. Hainan.