A very vigorous and massive climbing rattan palm found in lowland rainforests from Burma and the Andaman Islands south to peninsular Malaysia. Its strong canes can reach to 30 m (100 ft.) long and are a veritable fortress, armed with dense whorls of spines to 6 cm (2.5 in.) long. It is one of the most heavily armed of all Calamus. The leaves are large and spreading, with broad, grouped leaflets. It is best suited for the tropics and needs large trees for support. It provides strong canes for the manufacture of furniture and sports large, edible fruits with an attractive scaly shell.