“…Revisional studies have been made for the genus in several regions: in China and Indochina (Liou, 1934), Taiwan (Liao, 1995), Congo and tropical Africa (Robyns & Wilczek, 1949), Cameroon (Fouilloy, 1974), Madagascar (Van der Werff, 2003), the neotropics (Kostermans, 1938;Nishida, 1999), New Zealand (Wright, 1984) and Australia (Hyland, 1989). However, the genus has still to be revised for the Flora Malesiana region, except for the fact that Kochummen (1989) treated the genus for the Tree Flora of Peninsular Malaysia.…”