About thirty species are recorded in this genus distributed from South-East Asia to New Guinea. The genus belongs to the subtribe Phaiinae. Alluding to the lip which is short connate with the base of the column, to which is joined on each side by a membraneous fold. The flowers are borne on elongated inflorescences originating from the base of the pseudobulb, opening in succession over a long period of time.
Flowers are mostly yellow to orange coloured with sometimes red spots or flushing.
All species are characterised by the hinged lip which is sprung like a mousetrap, trapping an unsuspecting visiting insect and thus aid pollination. All drawings and photos are subject to copyright. Reproduction in whole or in part in any form or medium without express written permission is prohibited. All rights reserved.