Plants 20-30 cm tall. Rhizome elongate. Stem glabrous, with 2-4 sheaths toward base. Leaves 6-8, spreading, ovate-lanceolate, 5-13 × 1.2-3 cm, glabrous, base amplexicaul, apex acuminate or cuspidate-acuminate. Rachis 3-5 cm, glabrous, laxly 3-10-flowered; floral bracts foliaceous, ovate-elliptic, lower ones exceeding flowers. Flowers spreading, resupinate, pale green or yellow-green; lip white with purple venation on side lobes and purple markings on disk; ovary and pedicel ca. 15 mm, glabrous. Dorsal sepal ovate-elliptic, ca. 11 × 4 mm, apex acute; lateral sepals ovate-elliptic, ca. 10 × 3 mm, apex acute. Petals broadly ovate, slightly oblique, 7-10 × ca. 5 mm, apex acute; lip ca. 10 mm, with a short mesochile connecting hypochile and epichile; hypochile cymbiform, ca. 3 × 3 mm, with erect lateral lobes ca. 4 × 2 mm; mesochile sometimes inconspicuous, oblong, 1-2 × ca. 2 mm; epichile ovate-orbicular, ca. 3 × 3 mm, margin slightly undulate, with a pair of low keels. Column ca. 3 mm excluding anther, relatively thick. Fl. Jun-Jul. 2n = 40.
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