(Reinw. ex Lindl.) Pfitzer, Jahrb. Wiss. Bot. 19: 165 (1888)
A terrestrial herb. Leaves spreading, 4–5, narrowly elliptic, obtuse at minutely tridenticulate apex, 12–23 cm long, 3.4–4 cm wide, pale green, veined and lightly mottled darker green. Inflorescence 1-flowered; peduncle 16–36 cm long, purple, shortly white-pubescent; bract elliptic, obtuse, 1.5–2.5 cm long, 1–1.4 cm wide, ciliate on margins and mid-vein, pale green, very lightly spotted with purple. Flower 8-9.5 cm across; dorsal sepal pale green with darker green veins and a whitish pink margin; synsepal pale green; petals pale green with a pink-purple apical quarter, finely spotted with dark maroon in basal half to three-quarters; lip bright green with darker veins, often brown-flushed; pedicel and ovary 4.3–5 cm long, rather sparsely pubescent on ridges. Dorsal sepal ovate to elliptic, acute to retuse, 3–3.8 cm long, 2.5–2.9 cm wide, shortly ciliate, pubescent on outer surface. Synsepal lanceolate, acute, 2.5–2.6 cm long, 1.1–1.3 cm wide, pubescent on outer surface. Petals usually deflexed at c. 45° to horizontal, narrowly oblong, obtuse, 4.2–4.8 cm long, 1.3–1.4 cm wide, shortly ciliate. Lip 3.6–4 cm long, 1.8–2 cm wide, very shortly pubescent on outer surface, verrucose on side-lobes. Staminode reniform, 8 mm long, 10 mm wide, shortly pubescent all over surface. 2n = 36, 38.