Plants ca. 30 cm tall. Tuber oblong, ca. 20 × 0.8 mm. Stem ca. 10 cm, with 2 tubular sheaths at base, 2-leaved. Leaves cauline, alternate, widely spaced, green, lacking purple spots, oblong to oblong-lanceolate, 7.5-10.5 × 2-2.7 cm, glabrous, apex acute or acuminate. Inflorescence erect or slightly curved, ca. 15 cm, glabrous; rachis ca. 7 cm, subdensely 13-flowered; floral bracts foliaceous, ovate-lanceolate, 20-40 mm, conspicuously exceeding flowers, apex acuminate. Flowers purple, medium-sized; ovary cylindric-fusiform, 12-13 mm including pedicel, glabrous. Dorsal sepal erect, elliptic, ca. 5.5 × 2.5 mm, 3-veined, apex obtuse; lateral sepals spreading, obliquely ovate, ca. 7 × 3.5 mm, 3-or 4-veined, apex obtuse. Petals spreading, obliquely ovate, ca. 5 × 2.5 mm, inner surfaces finely papillose, 3-veined, margin ciliate, apex obtuse; lip reflexed, ovate, ca. 8 × 6 mm, thickened along midvein, disk finely papillose, margin ciliate, spurred, 3-lobed at middle; lateral lobes obliquely rhombic, falcate, ca. 2 × 2 mm, apex obtuse; mid-lobe oblong, 3.5-4 × 2-3 mm, apex acute; spur pendulous, cylindric, ca. 10 mm, shorter than ovary, apex obtuse. Fl. Jul-Aug.
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