Didymocarpus mengtze W. W. Smith var. zhenkangensis (W. T. Wang) H. W. Li.

Stems 5-22 cm, densely puberulent. Leaves opposite; petiole 0.1-2(-3.8) cm; leaf blade elliptic to broadly ovate or obovate, 1.3-7 X 0.9-3.5 cm, herbaceous, adaxially puberulent, eglandular, abaxially puberulent along veins, glandular, base oblique, cuneate to rounded, margin irregularly crenulate to dentate or serrulate, apex acute to rounded; lateral veins 4-7 on each side of midrib. Cymes 1-15-flowered; peduncle 1.5-3.5 cm, sparsely glandular puberulent; bracts free, broadly ovate to orbicular-ovate, 2.5-5 mm, nearly glabrous, margin entire. Pedicel 3-11 mm. Calyx zygomorphic, 2-3 mm, 3-sect from base; adaxial lip 3-lobed from near middle, broadly obovate, ca. 3 mm wide, lobes narrowly triangular, ca. 1 mm wide, 2 abaxial segments narrowly elliptic, 1-1.2 mm wide, glabrous, margin entire. Corolla purple to brick red, 1.8-2.4 cm, glabrous; tube nearly tubular, 1.3-1.6 cm X ca. 3 mm; adaxial lip 3-4 mm; abaxial lip 5-7.5 mm. Stamens glabrous; filaments ca. 3.5 mm; anthers ca. 1.5 mm; staminodes 2, ca. 0.3 mm. Pistil ca. 1.5 cm, glabrous; ovary ca. 1.2 mm. Immature capsule ca. 2.3 cm. Fl. Jul-Aug, fr. Aug.

* Rocks in valley forests; 1200-2700 m. SW Yunnan.