Description from Flora of China
Herbs. Rootstock a cluster of fusiform roots. Stems erect, to 20 cm, uniformly fine puberulent. Petiole 4-6 mm, winged; leaf blade elliptic, 2-5 × 0.6-1.6 cm, abaxially pale, sparsely hairy on veins only, adaxially densely puberulent, base cuneate, acute, lowermost leaves sometimes cuspidate. Peduncle 0.4-1.7 cm. Cymes umbel-like, 2-4-flowered, sometimes producing a second separated by short rachis. Pedicel 0.5-1.7 cm. Sepals linear-lanceolate, ca. 3 × 0.6 mm, glabrous. Corolla 3.6-4.3 cm, glabrous except for lobes; tube dark on basal half, pale on apical half, 1.3-1.6 mm wide, basal swelling ovoid, 4-6 mm wide, increasing gradually to 3.5-5.5 mm at base of lobes; lobes dark colored almost to base, minutely puberulent, 1.4-1.5 cm, linear, slightly curved inward at base, otherwise parallel except for sharply incurved tip. Outer corona lobes each with 2 linear teeth ca. half as long as inner lobes, ciliate; inner corona lobes linear, ca. 2.5 mm, erect.
* On limestone; ca. 2000 m. Yunnan.