Petiole to 4(-5.5) cm, adaxially glabrous to woolly, abaxially gray to brownish woolly to pannose; leaf blade broadly obovate to elliptic, rhombic, ovate, flabellate, or oblong, (0.5-) 1-5(-8) X (0.4-)0.8-3(-3.7) cm, flat to plicate or bullate, adaxially glabrous to densely villous, abaxially brownish pubescent to white to brownish woolly or puberulent to glabrous, margin subentire to crenulate, denticulate, or serrate, apex acute to rounded; lateral veins 3-5(or 6) on each side of midrib, adaxially flat to impressed, abaxially prominent to strongly prominent. Cymes (1-)4-15(-30)-flowered; peduncle (1-)3-17 cm, glabrescent to brownish woolly, glabrescent. Calyx 1.5-3.5 mm, outside glabrous to pubescent, rarely woolly. Corolla blue or purple to white or yellow, inside with or without spots on abaxial lip, (0.6-)0.8-1.4(-1.9) cm, outside glabrous to glabrescent; tube 5.5-10(-13) X 1.5-5.5 mm; adaxial lip lobes 0.6-2 mm; abaxial lip lobes 2-4(-6) mm. Stamens 2-6.5 mm; staminode 0.5-2.2 mm. Pistil glabrous; ovary 2-5 mm. Style 2-8 mm. Capsule narrowly oblong, 0.6-2.5 cm. Fl. Apr-Oct, fr. Jun-Dec.
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