Leaf 200–300 mm long; free part 15–20 mm long, ending below flowers. Spike 10–30 mm long, dense, 5–25-flowered. Flowers crowded, semi-nodding, 3–4 × 4–5 mm, dark purplish black and green. Dorsal sepal 2–2.3 × 1.6 mm, with dark bands; margins glabrous; apex drawn out. Lateral sepals widely divergent, 3 × 1 mm, base humped; apex sharply pointed. Petals 1.6 × 0.8 mm; margins glabrous; apex usually with a narrow, twisted white gland. Labellum stiffly hinged, ovate, 2 × 1 mm, fleshy; margins minutely toothed; apex recurved, sharply pointed. Callus broad, tapered, extending nearly to labellum apex.
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