Description from Flora of China
Munronia hunanensis H. S. Lo; M. petelotii Merrill; M. simplicifolia Merrill; M. unifoliolata var. trifoliolata C. Y. Wu ex F. C. How & T. C. Chen.
Shrublets 10-20 cm tall. Stem unbranched or few branched, puberulent, ± glabrescent. Leaves, clustered near stem apex, simple or extremely rarely apical ones trifoliolate; petiole 0.8-2(-3) cm, puberulent; leaf blade elliptic, oblong-elliptic, or ovate, 2.5-6(-12) × 1-2 cm, membranous to thickly papery, abaxially puberulent along midvein and secondary veins, adaxially glabrous or sometimes sparsely puberulent along midvein, secondary veins 3-7 on each side of midvein, base attenuate, cuneate, or rounded, margin entire or 1-3 crenate, apex obtuse, acute, or acuminate. Thyrses subterminal or axillary on apical part of stem, 3-5 cm, with 1-3 flowers. Pedicel (3-)5-10 mm, puberulent. Calyx puberulent; lobes linear to lanceolate, 2-4 mm, distinct, apex obtuse to slightly acuminate. Corolla white, 1.5-2.5 cm; tube slender, as long or longer than corolla lobes, outside sparsely puberulent; lobes oblanceolate, oblong-elliptic, or elliptic, 10-14 × 5-7 mm, apex shortly cuspidate to obtuse. Staminal tube exserted, glabrous; lobes linear to lanceolate, 1-1.5 mm, sometimes apically 2-cleft; anthers 1.6-2 mm, lanulose, apex ± mucronate. Ovary puberulent; style slightly exserted from filament tube. Capsule globose, puberulent. Seeds black, hemispheric, adaxially concave. Fl. Jun-Dec.
Forests in mountainous regions, shady places near cliffs and in rock crevices; 200-600 m. SW Guangzhou (Leizhou Bandao), Guizhou, Hainan (Wanning), W Hubei, Hunan, Sichuan, Yunnan [Vietnam].