Rhizomes stoloniferous, to 5 cm long. Roots wiry, striate, to 3mm in diam. Leaves linear, 20 - 39 cm long, 0.6 - 1.0 cm wide, up to 1.5 cm wide at base, wiry, arcuate, strongly keeled, glabrous, dark green, lighter green below; margins revolute; apex acute to apiculate, minutely trilobed, oblique. Inflorescence an unbranched, 4 - 9 flowered, spicate raceme, 10 - 45 cm tall. Peduncle dark brown to maroon, pilose with uniseriate multicellular hairs. Floral bracts ovate, 1.5 - 3.0 cm long, 1.0 - 1.6 cm wide, green with maroon veins; margins hyaline; apex acute, minutely bi- or trilobed. Sterile lower bracts 2 - 3, linear to linear-ovate, 2.5 - 10.0 cm long, 0.8 -1.2 cm wide, strongly keeled, lowest 3 - 12 cm from plant base; margins thin, often purple; apex acute, minutely bilobed. Flowers green to yellowish-green and white, with brown to maroon markings, nerves green or maroon-brown; outer surfaces mostly glabrous; inner surfaces mostly glabrous, but with some short, glandular pubescence; margins white, slightly to strongly undulate. Dorsal sepal ovate-lanceolate to elliptic, 2.7 - 3.5 cm long, 0.6 - 1.1 cm wide, white with 13 - 15 nerves, glabrous, with an occasional glandular hair; margins white, undulate; apex acute, minutely hooded. Synsepal ovate, 2.4 - 2.9 cm long, 1.0 - 1.8 cm wide, shorter than labellum, white with 20 - 21 nerves; margins white; apex obtuse. Labellum ovate, 2.0 - 3.8 cm long, 1.2 - 1.8 cm wide at widest point, green to yellow-green with darker green veins; labellar opening entire, rounded, flared; apical labellum rim minutely pubescent, edged with a thin brown line; apical labellum lining to 0.6 cm deep; lateral labellum rim flaring and sometimes slightly bulbous, spurs absent, edged with multicellular hairs; lateral labellum lining to 0.7 cm wide; claw face white with well-defined spots of 2 - 3 sizes and colors, upper spots small and green, lower spots larger and brown to maroon; claw interior pilose. Petals linear-lanceolate, 5.5 - 8.0 cm long, 0.4 - 0.9 cm wide, white, held at 10 – 15 ͦ angle from labellum, twisting 1- 3 turns; inner surface glabrous with sparse, short multicellular glandular hairs; basal hairs velutinous, dark red; margins sparsely ciliate, undulate; apex acute, often minutely bilobed, short glandular hairs present, but not densely congested. Staminode cordate to widely cordate, 0.3 - 0.5 cm long, 0.4 - 0.8 cm wide, green; apex acute to widely acute; basal margin and lateral lobes densely edged in shaggy maroon to black multicellular hairs. Column 0.3 - 0.5 cm long, green, sparsely pubescent with short, light colored hairs . Stigmatic area 0.4 - 0.5 cm wide. Ovary, including pedicel, 4 - 5 cm long, glabrous to sparsely pilose, green to maroon-brown. Capsule brown, glabrous, apex straight to slightly curved. Seeds to 0.5 mm long. Chromosome Number 2n=22 (Karasawa, 1980).