Description from Flora of China
Shrubs, semi-scandent, to 2 m tall, densely yellow-brown tomentose hairy, glabrescent. Petiole to 9 mm; leaf blade ovate-oblong to lanceolate, 3-14 X 1-5.5 cm, papery, adaxially dark brown when dry, base cuneate to subrounded, margin entire or serrulate, apex acute. Flowers solitary or paired. Pedicel ca. 1 cm. Bracteoles inserted at pedicel apex. Calyx tubular-ovoid, 1-2 cm, longer than wide, outside finely stellate hairy, inside pilose, veins 10; lobes 5, ca. 1/4 of calyx length, broadly ovate, apex acute. Corolla yellow, 2-3 cm, outside densely stellate tomentose, inside glabrous; upper lip apex truncate. Stamens and style as long as corolla. Ovary densely stellate tomentose. Capsule stellate tomentose. Fl. Jul-Aug.
Forests, rice fields. S Yunnan [Vietnam].