Plants 15-30 cm tall. Stem ascending, green-brown, 4-or 5-leaved. Leaves abaxially pale green, adaxially dark green with whitish stripes along midvein and 2 lateral veins, ovate, ovate-lanceolate, or elliptic, 1.5-8 × 1-5 cm, apex acute; petiole-like base and tubular sheath 0.9-2 cm. Peduncle 4-6 cm, pubescent, with 1 or 2 sheathing sterile bracts; rachis 4-6 cm, subdensely 3-10-flowered, pubescent; floral bracts lanceolate to ovate-lanceolate, 8-10 mm, subequal in length to ovary, abaxially glabrous, ciliate along basal margin, apex acuminate. Flowers resupinate, yellow; ovary and pedicel twisted, fusiform, 9-10 mm, glabrous. Sepals yellowish green, glabrous, 1-veined; dorsal sepal forming a hood with petals, ovate to ovate-oblong, cymbiform, 4-6 × 3-4 mm; lateral sepals spreading, ovate-elliptic, oblique, 6-7.5 × 4-5 mm, apex acute to slightly obtuse. Petals whitish green, ovate, strongly oblique, 4-6 × 2.5-4 mm, 1-veined; lip golden yellow, Y-shaped, 12-18 mm; hypochile slightly dilated, bisaccate, ca. 3 mm, containing a central longitudinal septum and 1 subulate, usually curved callus on either side; mesochile 4-6 mm, with a pectinate flange along either margin; flanges composed of 4-7(-9) obtuse teeth to ca. 2.5 mm; epichile transversely dilated, 2-lobed; lobes diverging widely, cuneate-oblong to obovate, 5-6 × 4-4.5 mm, margin entire or slightly crenulate, apex truncate. Column very short, squat, with 2 deltoid wings toward apex; rostellum twisted, broad, remnant bifid; stigma lobes separate, large. Fl. Jun-Sep. 2n = 60, 120.
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