Rhizomes yellow inside, tuberous; roots with fusiform tubers at tip. Pseudostems ca. 1.3 m. Leaf sheath membranous at margin; ligule 2-lobed, 1--6 mm, membranous; petiole absent to 5 mm, appressed pubescent; leaf blade narrowly elliptic, rarely lanceolate, 8--30 × 1.5--5 cm, adaxially glabrous, abaxially sparsely appressed pubescent, base attenuate, apex acuminate. Inflorescences arising from rhizomes, ovoid or narrowly ellipsoid, 5--6.6 × 2--3.5 cm; bracts purple, narrowly ovate, ca. 4.5 × 1.3(--2) cm, sparsely appressed pubescent abaxially, apex shortly acuminate; bracteoles narrowly ovate, 3.4--4 × ca. 1 cm, apex obtuse. Calyx glabrous, 2.3--2.5 cm, split on 1 side, apex subtruncate, with 3 rounded teeth. Corolla tube 3--4 cm; lobes yellow, central one ovate, ca. 3 × 1.4 cm, lateral ones lanceolate, ca. 2.5 cm × 8 mm. Labellum yellow with pink spots, broadly ovate, ca. 3.5 × 3 cm, margin slightly undulate, apex retuse; lateral lobes absent. Anther subsessile, ca. 1.4 cm; connective appendage ca. 1.8 cm. Ovary densely appressed pubescent. Style 6--6.7 cm; stigma ciliate. Stylodes needle-shaped, ca. 8 mm. Fl. Jul.
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