The following genera are among those most commonly cultivated: Acanthophoenix Chamaerops Martinezia Acanthorhiza Cocos Oreodoxa Areca Corypha Phoenix Bactris Geonoma Pritchardia Brahea Hyophorbe Rhapis Calamus Kentia Sabal Caryota Latania Stevensonia Ceroxylon Livistonia Thrinax Chamaedorea Ferns.
The great peculiarity of Andaman flora is that, with the exception of the Cocos islands, no cocoanut palms are found in the archipelago.
The Australian Shelf rises steeply as a rule from depths, of 2500 to 3000 fathoms. A broad depression with depths of from 3300 to 3500 fathoms lies to the east of the Cocos Islands and extends into the angle between the Malay Archipelago and Australia.
The coco-nut (as the name Cocos Islands indicates) is the characteristic product and is cultivated on all the islands.
Towards the centre, the Maldive, Chagos and Cocos groups are of characteristic coral formation, and coral reefs occur on most parts of the tropical coasts.