Terrestrial herbs with small, ovoid or ellipsoid tubers. Leaves radical, 1-2, appressed to ground, sessile, ovate or orbicular, sometimes withered by flowering time. Inflorescence erect, unbranched, with or without sheaths, sparsely to densely flowered. Flowers sessile or shortly stalked, often secund. Sepals subegual, free, sometimes setose, often hairy, usually green. Petals usually longer (often much longer) than sepals, entire or lobed, often rather fleshy. Labellum lobed or toothed, rarely entire, spurred; adnate to column at base. Column short; anther loculi parallel; pollinia two, granular; caudicles short; viscidia mall, naked; stigma sessile. (PC).