Plants leafy, autotrophic, 30-50 cm tall. Stem slender to somewhat robust, with several basal sheaths, 6-8-leaved, slightly scabrous toward apex. Leaves broadly lanceolate to oblong-lanceolate, 6-14 × 1.5-3 cm, abaxially scabrous on veins, apex long acuminate. Inflorescence ± laxly 8-15-flowered; rachis 3-5.5 cm; floral bracts linear-lanceolate, basal 2 to ca. 10 cm, becoming shorter and narrower above. Flowers erect, weakly spreading, white; pedicel and ovary 12-16 mm. Sepals narrowly ovate to lanceolate, 10-13 × 2-3 mm, apex acute to acuminate. Petals ovate, 8.5-9 × ca. 3 mm, apex acute to mucronate; lip shorter than petals, 5.5-7 mm, spurred at base, 2-partite; hypochile broadly ovate; hypochile lobes erect and embracing column, triangular, 2-2.5 mm, apex subacute-falcate; epichile ovate-cordate, ca. 3.5 × 4-4.5 mm, with 3 longitudinal lamellae, papillate at apex, margin slightly undulate, apex acute; spur protruding slightly between bases of lateral sepals, slightly incurved, conic, 1-1.5 mm, apex obtuse. Column 5.5-6.5 mm; anther ovoid, ca. 1.5 mm. Capsule erect, 2-2.5 cm. Fl. May-Jun, fr. Aug-Sep. 2n = 30, 32, 33, 34, 36.
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