Terrestrial herb, slender geophyte, 0.15-0.50 m high; with ovoid root tubers. Leaves 2-4, cauline, linear, conduplicate, acute, up to 200 mm long. Inflorescence capitate. Flowers 5-25, secund, white to cream-coloured with small purple spots on petals. Sepals unequal, median sepal galeate 5-10 mm long; lateral sepals spreading, 6-10 mm long; spur 3.5-6.0 mm long, straight. Petals erect, narrowly oblong-pandurate, apical lobe spreading, fan-like. Lip small, < 2 mm long. Flowering time Jan.-Mar.