Description from Flora of China
Didymocarpus pinnatifidus DidymocarpuspinnatifidusHandel-Mazzetti, Sinensia 5: 8. 1934; Chirita quercifolia D. Wood.
Perennials, stemless. Rhizome internodes inconspicuous. Leaves basal, opposite; petiole 1.5-10 cm X 1-3 mm; leaf blade oblong to lanceolate or narrowly ovate, 3-20 X 1.5-7.8 cm, herbaceous, appressed puberulent to pilose, eglandular, base cuneate to broadly cuneate, margin irregularly pinnately lobed, apex acute to rounded; lateral veins 3-5 on each side of midrib, inconspicuous. Cymes 1-4-flowered; peduncle 4.5-20 cm, spreading villous to pilose; bracts 2, free, oblong to ovate or obovate, 5-14(-25) X 1.5-8(-10) mm, pubescent to appressed pilose, margin denticulate to entire, apex acute. Pedicel 0.5-2 cm, pubescent to pilose and glandular puberulent. Calyx 5-sect from base; segments equal, linear-lanceolate to narrowly ovate or oblong, 3-7 X 1-3 mm, puberulent, margin 1- or 2(or 3)-denticulate, apex acute to rounded. Corolla purple to white, tinged purple, 3.2-4.5 cm, outside sparsely puberulent, inside puberulent below adaxial lip; tube tubular-funnelform, sometimes gibbous abaxially, 1.8-2.8 X 0.9-1.3 cm; adaxial lip 6-10 mm; abaxial lip 1-1.5 cm. Filaments 1-1.1 cm, sparsely glandular puberulent; anthers fused by entire adaxial surfaces, 1.5-3.8 mm, glabrous to sparsely pubescent; staminodes 2, 2-4 mm. Pistil 2.4-3 cm, densely puberulent to nearly glabrous; ovary ca. 1.4 cm. Stigma oblong to obtrapeziform, 1-4 mm, 2-lobed. Capsule at ca. 90 to peduncle, 3-4 cm. Fl. May-Sep, fr. Aug-Nov.
* Rocks, streamsides in forested valleys; 600-2100 m. W Fujian, N Guangdong, Guangxi, S Hunan, Jiangxi, S and W Zhejiang.