Description from Flora of China
Didymocarpus hedyotideus W. Y. Chun, Sunyatsenia 6: 291. 1946.
Perennials, stemless. Rhizome internodes inconspicuous. Leaves basal, opposite; petiole nearly absent to 2 cm X 1.5-3 mm; leaf blade elliptic to lanceolate, often falcate, 6.5-12 X 0.9-2.4 cm, leathery, appressed pilose, eglandular, base attenuate, margin entire, revolute, apex attenuate; lateral veins 3 or 4 on each side of midrib, conspicuous abaxially. Cymes 12-20-flowered; peduncle 5.5-21 cm, densely puberulent; bracts 2, free, narrowly elliptic to lanceolate, 3-5 X 1.5-2 mm, puberulent, margin entire, apex acute. Pedicel 2-5 mm, puberulent. Calyx ca. 1.5 mm, 5-lobed from middle; tube ca. 0.5 mm; lobes equal, broadly triangular, ca. 1 X 1 mm, outside puberulent, inside glabrous, margin entire, apex acute. Corolla purple, 0.9-1.5 cm, outside puberulent, inside glabrous; tube cylindric, 7-10 X ca. 3 mm; adaxial lip ca. 2.5 mm; abaxial lip ca. 6 mm. Filaments ca. 6 mm, sparsely puberulent; anthers fused by entire adaxial surfaces, ca. 2 mm, glabrous; staminodes 2, ca. 4 mm. Pistil ca. 1 cm, puberulent; ovary ca. 6 mm. Stigma obtrapeziform, ca. 1 mm, 2-lobed. Capsule erect, 2-3 cm. Fl. Aug-Oct, fr. Sep-Oct.
* Shaded rocks or cliffs in limestone hills; ca. 200 m. SW Guangxi (Longzhou Xian, Ningming Xian).