The genus is native to the Old World , with the species concentrated around the equatorial regions - eastern and southeastern Asia including the Philippines with 10 species ( 9 of which are endemic ) , eastern Africa ( including Madagascar ) , northern Australia , Polynesia , and Micronesia .
It is native to eastern and southeastern Asia including the Philippines with 6 species ( 4 of which are endemic ) , eastern Africa ( including Madagascar ) , northern Australia , Polynesia , and Micronesia .