Plants 4-24 cm tall, slender. Rhizome short. Stem erect or ascending, pale brown, with several to many leaves. Leaves cauline, usually clustered and overlapping, pale brown, linear to linear-lanceolate, sometimes bractlike, 2-8 × 0.2-0.6 cm, base directly sheathing stem, not stalked, apex acuminate. Inflorescence 2-7 cm, glabrous, with a few to more than 20 densely arranged flowers; floral bracts reddish brown, ovate-lanceolate, 8-12 mm, longer than flower, glabrous, apex long acuminate. Flowers resupinate, white or yellowish white, small; ovary and pedicel elliptic-cylindric, 5-6 mm, glabrous. Sepals glabrous; dorsal sepal narrowly ovate-oblong, concave, 4-6 × 2-3 mm, 1-veined, apex obtuse; lateral sepals obliquely oblong, 4-5.5 × 1.5-2.5 mm, 1-veined, apex acute or obtuse. Petals subovate to obovate, oblique, 4-5.5 × 1.5-1.8 mm, glabrous, 1-veined, apex obtuse; lip pale yellow to yellow, cymbiform, 4-5 mm, 3-partite; hypochile concave-saccate, containing 2 subtriangular, lamellate calli; mesochile ca. 1 mm, exterior surfaces minutely papillate toward apex, margin denticulate, involute; epichile transversely elliptic-oblong, 1.4-1.8 × 2-2.5 mm, minutely papillate, apex with a small mucro to slightly emarginate. Column ca. 1.5 mm; wings longitudinally oblong; rostellum arms ca. 0.6 mm. Capsule pale brown, elliptic, ca. 6 mm. Fl. Mar-Jul. 2n = 20, 22, 40, 42, 50, 100.
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Plants 4–25 cm. Roots clustered at nodes of subterranean part of stem and rhizome, short. Stems from decumbent base, erect or ascending, greenish, tinged with purple or brown, slender. Leaves 5–12, spirally arranged, sessile, sheathing; blade erect, dark green, linear to narrowly lanceolate, keeled, 1–9 × 0.3–0.8 cm, apex long-acuminate. Inflorescences 8–50-flowered; rachis 1–8 cm; floral bracts green, ovate-lanceolate to lanceolate, 15 × 4 mm. Flowers white with prominent yellow lip; dorsal sepal concave, ovate-oblong to oblong-elliptic, 4–7 × 2–3 mm, apex obtuse; lateral sepals oblique, ovate-oblong to oblong-elliptic, 4–6 × 2–3 mm, apex obtuse to acute; petals oblong-lanceolate, falcate, 4–6 × 1.5–2 mm, converging with dorsal sepal; lip adnate to base of column, sessile, base concave, subsaccate or cymbiform, containing 2 glands, lamina ± contracted in middle, abruptly dilated at apex, not extending beyond lateral sepals, 4 × 3 mm, fleshy; column 1.5 mm; anther between 2 large stigmatic processes, scarious; pollinia yellow; ovary sessile, stout, 7 mm. Capsules suberect, ovoid to ellipsoid, 7 mm. 2n = 22–64, 30–56, 50, 100.
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