Plant at fl. c. 10–50 cm. tall, often gregarious. Lf linear, fleshy, roundly thickened on margins and keel and so ± trefoil-shaped in T.S. Infl. 1–c. 6-fld. Per. c. 10–15 mm. long, most commonly blue, less commonly white, petals and occ. other tepals strongly striped with darker blue, occ. wholly pink without obvious stripes. Lateral sepals narrow. Petals broad-elliptic. Labellum broadly obovate, sts slightly crenate towards tip or mucronate. Column short; anther bent forward, almost fully exposed, ending in 2 short horns; column-arms ± ribbon-like, tending to twist inwards into ½–1½ turns of a loose spiral, tip sts unevenly notched; post-anther lobe lacking; a narrow band of clear, blister-like, crowded calli lies across back of anther between bases of column-arms and sts extends up their lower margins.