Plants 16-45 cm tall. Rhizome short, rigid; roots 1.5-2.5 mm in diam., fleshy. Stem solitary or 2 arising from same rhizome, erect, unbranched or 1-branched, internodes 3-6.5 cm; proximal nodes naked or with tubular sheaths, distal nodes enclosed in sheaths 1.5-3(-6.5) cm. Leaves 2, apical, subopposite, elliptic or ovate-elliptic, (6-)10-17 × (3-)4.5-9.5 cm, papery, base contracted into amplexicaul sheaths, apex long acuminate. Inflorescence a terminal raceme with more than 10 flowers, 5-8 cm; floral bracts narrowly lanceolate, 6-8 mm, midvein conspicuous. Flowers not resupinate, greenish white; pedicel and ovary 6-9 mm. Dorsal sepal linear-lanceolate, 8-9 × ca. 1.5 mm, apex acuminate or acute; lateral sepals almost completely connate and forming a synsepal; synsepal suboblong, 8-10 × 2-2.5 mm, apex shallowly 2-lobed, embracing lip and connected to spur at its base. Petals linear-lanceolate, 8-9 × ca. 1.5 mm; lip suboblong, 6-7 × ca. 2 mm, with 2 slightly thickened longitudinal ridges from middle to base, base spurred; spur cylindric, ca. 4 × 1-1.5 mm, apex obtuse. Column ca. 6 mm; anther erect, ovoid-lanceolate, ca. 3.5 mm; rostellum erect, lanceolate, ca. 5 mm. Capsule oblong-ellipsoid, 1-1.5 cm × 6-7 mm. Fl. Sep, fr. Dec-Jan. 2n = 57.
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