Stems 20-50 cm, sparsely purple spotted, sparsely spreading glandular pubescent toward apex, simple or sparsely branched, with 10-15 nodes. Petiole 1.1-5.5 cm; leaf blade narrowly elliptic-lanceolate, 6-13.5 X 2-4 cm, adaxially sparsely pubescent, abaxially glabrous, base oblique, cuneate, margin entire, apex acuminate, without sclereids; lateral veins 8-12 on each side of midrib. Cymes 2- or 3-flowered; peduncle 1-2 cm, glandular pubescent; involucre ca. 1 cm in diam., outside sparsely glandular pubescent. Calyx 5-sect from base; segments equal, narrowly lanceolate, ca. 10 X 3 mm, outside and margin sparsely glandular puberulent. Corolla outside pale yellow, inside sparsely purple spotted, ca. 3 cm, outside sparsely glandular puberulent, inside with a ring of hairs; tube 2-4 cm; adaxial lip ca. 3.5 mm; abaxial lip ca. 6 mm. Anthers ca. 2.5 mm; staminodes 3, 1.2-7 mm. Pistil ca. 1.8 cm, sparsely glandular puberulent. Capsule 1.7-2 cm. Fl. Sep-Oct, fr. Nov.

* Shaded areas in montane valleys; ca. 100 m. SW Guangxi.