Epiphytic herbs often with showy flowers and ancipitous, terete, solid or hollow pseudobulbs. Sepals subequal, free, spreading, flat or undulate. Petals similar to the sepals, sometimes broader. Lip free from or slightly connate with the column, 3-lobed (or nearly simple), the lateral lobes enfolding the column or more or less explanate; disc smooth or lamellate; column-long or short, winged or wingless. Anther operculate, incumbent, each cell divided into two by a septum and with each-cell sometimes again divided by a more or less perfect septum; pollinia 8, 4 in each cell of the anther, ovate or compressed laterally, ceraceous.
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