Small plants with roundish tuberoids. Leaves 1-2 or several, cauline or ± basal. Inflorescence dense, with many small greenish or yellowish-green, resupinate flowers. Perianth segments connivent; sepals subequal, petals sometimes longer. Labellum entire or 3-lobed or 3-5 dentate, flattish-ligulate, spurless, but sometimes ± concave at base. Column very small; anther erect, without canals, cells parallel or slightly divergent downwards; pollinia 2, sectile, with very short caudicles, attached to separate, large, sometimes brown-shining, horn-like viscid glands; stigma 2, distant, sessile, cushion-shaped or protruding; staminodes 2, sometimes strap-shaped. Ovary ± sessile, slightly twisted, apex ± bent downwards.