A lithophytic or terrestrial herb with well-spaced growths up to 15 cm apart on an elongate rhizome. Leaves 5–7, oblong, obtuse or acute, tridenticulate at apex, 6–15 cm long, 1.8–2.5 cm wide, strongly marbled dark and light bluish green above, densely purple-spotted below, serrulate on margins. Inflorescence 1-flowered; peduncle 23–60 cm long, green, spotted with purple, brownpubescent; bract conduplicate, lanceolate-ovate, subacute to acute, about 1.5 cm long, green, spotted purple, pubescent. Flower very large for size of plant, 6–11 cm across, bright golden yellow with red veins on the staminode, spotted purple inside lip, pubescent on inside and outside; pedicel and ovary 3–3.5 cm long, green, pubescent, rostrate at apex. Dorsal sepal ovate, subacute, 2.2–5 cm long, 1.4–3.3 cm wide, pubescent near the base. Synsepal ovate, obtuse, 2–3.5 cm long, 1.8–2.6 cm wide, bicarinate on outside. Petals ovate to subcircular, rounded to subacute at apex, 2.8–5.5 cm long, 2.5–4.4 cm wide, ciliate, pubescent at base. Lip very inflated, thin-textured, large, 4–6.5 cm long, 2.2–5.2 cm wide, with margins incurved, white-pubescent and purple-dotted inside at base. Staminode large, convex, cordate, acute, 10–22 mm long and wide. 2n = 26.