Didymocarpus dielsii Borza, Repert. Spec. Nov. Regni Veg. 13: 390. 1914; Chirita orbicularis W. W. Smith; Didymocarpus uniflorus (Franchet) Borza; Roettlera uniflora Franchet (1899), not C. uniflora Ridley (1912).

Perennials, stemless. Rhizome internodes inconspicuous. Leaves basal, opposite; petiole 1-5(-8) cm X 1.5-3 mm; leaf blade broadly ovate to broadly obovate or orbicular to reniform, 2-11 X 2-8 cm, herbaceous, adaxially between lateral veins with long white hairs 3-6.5 mm, eglandular, abaxially puberulent, white to brownish pubescent to pilose along veins, base rounded to cordate, margin dentate to crenate or serrate, apex obtuse to rounded; lateral veins 4 or 5 on each side of midrib, conspicuous. Cymes 1(or 2)-flowered; peduncle 3-8(-11) cm, pubescent to sparsely pilose; bracts 2 or absent, free, lanceolate to oblanceolate, 0.8-1.2 cm X 1-2.5 mm, pubescent, margin entire to sparsely denticulate, apex acute. Pedicel 3-4 cm, pubescent to sparsely pilose. Calyx 1-1.7 cm, 2-lipped; adaxial lip 4-lobed from above middle; tube 1-3 mm; lobes triangular, 4-5 X 2-2.5 mm; abaxial lip entire, linear to lanceolate, 1-1.5 cm X 3-4 mm, outside sparsely pubescent to pilose or glabrous, inside glabrous, margin entire, apex acuminate. Corolla purple to purple-blue, 4-7 cm, glabrous; tube funnelform-tubular, 2.8-5 X 1.2-2 cm; adaxial lip 1-1.2 cm; abaxial lip 1.2-2 cm. Filaments ca. 1 cm, glabrous; anthers fused by entire adaxial surfaces, ca. 3 mm, glabrous; staminodes 2, ca. 5.5 mm. Pistil ca. 3 cm, glabrous; ovary ca. 1.8 cm. Stigma flabellate, ca. 5 mm, 2-lobed. Capsule erect, 6-12 cm. Fl. Jun-Sep, fr. Aug-Sep.

After publication of the family treatment for the Flora of China, this was treated as Henckelia dielsii (Borza) D. J. Middleton & Mich. Möller (Taxon 60: 775. 2011).

* Shaded rocks in montane regions; 1900-3400 m. Yunnan (Fengqing Xian, Lufeng Xian, Yongsheng Xian).