Description from Flora of China
Herbs perennial. Stems 0.3-2.7 m tall, trailing, apically flaccid, densely stellate tomentose and long stipitate stellate lanate. Petiole 2.5-7 cm; leaf blade ovate to elliptic, 12-27.5 × 7-19 cm, adaxially stellate tomentose and strigose, abaxially tawny or gray, densely stellate tomentose, base broadly cuneate to subtruncate, margin serrate-crenulate, apex acute to obtuse. Inflorescences thyrses at stem base, 6-10 cm including peduncle 2.5-7 cm; cymes 2- or 3-flowered; bracts purple-red, ovate to subcircular, 1.4-2 × 1.3-1.5 cm, margin remotely serrulate; bracteoles subcircular to spatulate, unequal, shorter than bracts. Calyx campanulate, 11-13 × 6-8 mm; teeth ovate-oblong, 4-4.5 mm, apically acute, ± gray stellate tomentose. Corolla yellow, ca. 3.6 cm, puberulent, ca. 2 mm wide at base, apical half of tube abruptly dilated to 9 mm wide at throat; upper lip erect, oblong, ca. 11 × 8 mm, apex rounded and mucronate; lower lip ca. 1.3 × 1.2 cm, middle lobe circular, ca. 6 × 6 mm; lateral lobes ovate, ca. 3.5 × 3.5 mm. Nutlets orange when fresh, purple-brown when dry, 2-4, oblong, triquetrous, 4.5-5 × ca. 3 mm, adaxially ribbed, abaxially rounded, Fl. and fr. Sep-Feb.
Thickets, densely forested valleys, hilly slopes; 700-2700 m. Yunnan [India].