KEY TO THE SUBSPECIES

1	Leaves oblong to lanceolate, 2-4 ½ times as long as broad, apex acuminate to cuspidate. Cratoxylum sumatranum subsp. sumatranum
1'	Leaves elliptic to elliptic-oblong, 1½-2¾ times as long as broad, apex rounded or, more rarely, acute to shortly acuminate. Cratoxylum sumatranum subsp. blancoi