Stem erect, cylindric, 30-40 cm or longer, ca. 2 mm in diam., upper part with opposite leaves, internodes 3-5 cm. Leaves linear, ca. 11 × 0.4 cm, leathery, 3-veined, base slightly contracted and then dilated into sheath, apex acuminate; leaf sheath tubular, ca. 3.5 cm, tightly embracing internodes. Inflorescence umbellate, lateral, 2-flowered, spreading at right angle outward; peduncle ca. 13 mm, with 1 or 2 basal sheaths. Pedicel and ovary ca. 1 cm. Flowers opening slightly, pale yellow; sepals with purple spots on both sides at middle. Sepals narrowly lanceolate, ca. 3 cm, base ca. 3.5 mm wide; mentum ca. 5 mm, ± curved. Petals ca. as long as sepals, but relatively narrow; lip 3-lobed; lateral lobes erect, small, obtuse; mid-lobe triangular-lanceolate, somewhat large, 1-1.5 cm, margin fimbriate-toothed, apex recurved; disk pubescent.
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