Description from Flora of China
Petrocosmea henryi Craib.
Petiole 0.5-5(-7) cm, whitish to tan densely pubescent; leaf blade rhombic to elliptic to ovate or obovate, rarely nearly orbicular, (0.5-)1-2(-5) X 0.5-1.5(-2.4) cm, adaxially densely whitish to tan pubescent, hairs both long and short, abaxially densely puberulent, base broadly cuneate to cuneate, rarely rounded, margin crenate to repand-crenulate or serrate, apex broadly acute to rounded; lateral veins abaxially conspicuous. Cymes 1- or 2-flowered; peduncle 3.5-7.5 cm, whitish to tan pubescent; bracts linear, 2-4 mm. Pedicel 1.4-2.5 cm. Calyx actinomorphic, 5-sect from base; segments equal, narrowly triangular, 3-6 X 0.6-1.2 mm, outside whitish to tan pubescent. Corolla purple with whitish base, outside pubescent, inside glabrous; tube 2.5-5 mm; adaxial lip 2-4 mm, indistinctly 2-lobed; abaxial lip 0.8-1.2 cm. Filaments ca. 2.2 mm, densely brown puberulent near apex; anthers narrowly ovoid, ca. 3 mm, beakless; staminodes 2. Pistil 8-11 mm; ovary 2-3 mm, appressed puberulent. Style appressed puberulent near base. Capsule 5-8(-10) mm. Fl. and fr. Aug-Nov.
* Limestone rocks in forests, forest margin; 1000-2200 m. SE Yunnan.