Didymocarpus martinii H. Léveillé & Vaniot in H. Léveillé, Compt. Rend. Assoc. Franç. Avancem. Sci. 34: 426. 1906; Boea martinii (H. Léveillé & Vaniot) H. Léveillé; Chirita martinii H. Léveillé & Vaniot; Paraboea barbatipes K. Y. Pan.

Subshrubs or herbs. Stems to 30 cm, gray-brown cobwebby-woolly to pannose. Leaves opposite, mostly crowded near stem apex or spread along stem; petiole 2-10 cm; leaf blade elliptic to ovate or oblanceolate, 6-14 X 3-7.5 cm, papery, adaxially cobwebby-woolly, glabrescent, abaxially brown pannose, base sometimes oblique, cuneate to rounded, margin serrulate to crenulate, apex acuminate to acute; lateral veins 7-11 on each side of midrib. Cymes terminal or axillary; peduncle 5-20 cm, cobwebby-woolly, glabrescent; bracts 2, lanceolate to ovate, 0.7-3 cm X 4-13 mm, outside pannose. Pedicel 0.7-1.5(-2) cm. Calyx 5-sect from base; segments narrowly oblong to narrowly triangular, 2-3 X 0.5-1 mm, outside sparsely puberulent. Corolla purplish to blue, 1.5-2.5 cm, outside glabrous to puberulent; tube 7-10 mm; adaxial lobes ca. 3 X 4 mm; abaxial lip ca. 8 mm, lobes 2.5-6 mm. Filaments ca. 1 cm, bearded; anthers ca. 4 mm; staminodes 2, ca. 3 mm. Pistil glabrous; ovary 5-6 mm. Style 4-6 mm. Capsule spirally twisted, 2.5-6.5 cm, glabrous. Fl. May, fr. Jul-Aug.

* Limestone in forests; 400-1500 m. Guangxi (Napo Xian), Guizhou (Libo Xian), Yunnan (Xichou).