Rhizomes with fleshy scales. Stems 20-50 cm, pilose, glabrescent. Petiole 0.3-6.5 cm; leaf blade elliptic to ovate, (2.5-) 10-27 X (1.2-)4.5-12.5 cm, appressed puberulent to scabrous, base oblique, attenuate to rounded, margin repand to coarsely double serrate or dentate, apex acute to acuminate. Inflorescences many flowered; rachis pilose; bracts lanceolate to linear, (2-)5-10 mm. Calyx segments lanceolate to narrowly triangular, 0.7-1.3 cm. Corolla yellow, inside purple spotted from lobes to base, 3-4.5 cm; tube 2.6-3.7 cm; adaxial lip 4.5-6 X ca. 5 mm; abaxial lip 6-8 X ca. 8 mm. Stamens glabrous; filaments 2.2-2.7 cm; staminode ca. 0.5 mm. Pistil 2-3 cm; ovary densely appressed puberulent. Style 1.8-2.8 cm, glabrous; adaxial stigma 0.4-0.8 mm, abaxial ca. 1.2 mm. Capsule 6-8 X 3-5.5 mm. Fl. Jul-Nov.
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