tuberous or pseudobulbous herbs. Leaves 1 to many, basal, appearing
with or after the flowers, base
contracted into a long petiole. Inflorescence erect, lateral or subterminal, single or laxly to densely many flowered
racemes or rarely panicles. Flowers resupinate, small to large, sometimes
showy; pedicel and ovary slender. Sepals free, similar; lateral sepals slightly
oblique, adnate to column foot. Petals slightly wider to dorsal sepal; lip
erect, 3-lobed, lateral lobes embracing column, spurred or saccate. Column
short or long, winged; anther terminal, incompletely 2-locular; pollinia 2 or 4, cleft, waxy, viscidium suborbicular.