KEY TO THE SECTIONS IN MALESIA

1Colleter(s) in the leaf-axils deltoid and usually more or less as wide as the leaf-scars, or narrowly triangular and 0.3-0.7 mm wide; corolla lobes sinistrorse; seeds rounded at both ends; leaves in whorls of 3-9; copious white latex from the trunk bark of the tree
1'Colleters minute or shortly lingulate or narrow, 0.1-0.15 wide; corolla lobes dextrorse; seeds acuminate at one end; leaves in whorls of 3 or 4; without white latex from the trunk bark of the tree