Description from Flora of China
Herbs perennial, 7--40 cm tall, not aromatic. Stems erect, angular or narrowly winged, ± minutely glandular on young parts. Leaves alternate; petiole 0.5--1.5 cm, glandular; leaf blade elliptic, 6.5--13 X 3--6.5 cm, abaxially whitish farinose, base attenuate, apex acute; veins 6--8 pairs, raised abaxially; veinlets prominently reticulate. Racemes terminal and axillary, 4--9-flowered; rachis 2.5--10 cm, sometimes flowers clustered on lower part of stem; lowest bracts leaflike, to 1.5 cm, gradually reduced upward to ca. 4 X 1 mm. Pedicel 1.3--2.5 cm. Calyx ca. 6 mm, enlarging to 8 mm in fruit; lobes lanceolate, glandular, narrowly hyaline margined, apex subulate. Corolla yellow, deeply parted; lobes lanceolate, ca. 7 X 2.5 cm, apex acute. Filaments connate basally into a ca. 0.3 mm high ring, free parts ca. 1 mm; anthers ca. 4.5 mm, basifixed, opening by apical pores. Capsule globose, ca. 1/2 as long as calyx. Fl. May-Jun.
* Deep in forests, shaded areas on N-facing mountain slopes; ca. 300 m. SW Guangxi.