Description from Flora of China
Herbs 5-20 cm tall, perennial, caulescent or acaulescent. Petiole 1.8-4.5(-5.5) cm, densely hirsute; leaf blade oblong to lanceolate-oblong, rarely ovate or oblanceolate, 3-7(-11) × 1.5-3(-4) cm, papery, both surfaces densely covered with cystoliths, abaxially pilose or sometimes only hairy along veins, adaxially dark grayish brown when dry and subglabrous, midvein raised on both surfaces, secondary veins 5-7 on each side of midvein and raised on both surfaces, base oblique and rounded to broadly cuneate, margin entire or slightly crenulate, apex acuminate to obtuse. Cymes axillary, (1 or)2-4(or 5)-flowered; peduncle 2-10 cm, densely hirsute; bracts subleaflike, ovate to ovate-elliptic, 8-10 × 4-7 mm. Calyx lobes linear, 1-1.2 cm but to 1.7 cm in fruit, white pilose. Corolla purple, ca. 4 cm, straight, outside subglabrous; tube cylindric and ca. 2.5 mm wide for 1.3-1.5 cm then gradually widened to ca. 1 cm at mouth; lobes oblong, 6-8 × 5-6 mm. Staminal filaments 5-6 mm; anther thecae ovoid, ca. 3 mm, subequal, ciliate, each with 1 spur at base. Ovary densely pilose; style ca. 3.2 cm, pilose; stigma 2-lobed, with one lobe longer. Capsule cylindric, ca. 1.1 cm, densely pilose, 12-16-seeded. Seeds elliptic in outline, ca. 1.5 mm, margin white. Fl. Apr-Jun, fr. Aug-Sep.
Limestone hills in forests; 500-2000 m. Guangxi, Yunnan [Vietnam].