Plants perennial, up to 60 cm tall, often in colonies. Rhizome creeping. Leaves 3-5(-6); suborbicular to elliptic; acute to acuminate, up to 15x10 cm, margins ciliolate with glandular hairs. Inflorescence usually 1-flowered, rarely 2-3-flowered. Bract leaf-like, 6-11 cm long. Sepal pale yellow-green, the dorsal ovate-lanceolate, acuminate, 3-4x 1.2-1.8 cm, the lateral ± fused with 5-15 mm long tips. Petals narrower, 3-4 x 0.6-0.8 cm. Labellum white, outside towards base with some purple spots, slipper-like, up to 3 cm long. Column 12-15 mm long, including the subcordate staminode, which on upper side is yellow with some dark purple spots. Ovary pedicellate, covered with short glandular hairs.