KEY TO THE SUBSPECIES

1	Pedicel of male flowers pubescent, at least in the lower half. Male buds subglobose; androecium subglobose, thecae 18-24. Fruits subglobose to broadly ellipsoid, 2.5-4 cm long Horsfieldia subalpina subsp. subalpina
1'	Pedicel of male flowers glabrous. Male buds (broadly) ellipsoid; androecium (broadly) ellipsoid, thecae 16 or 18. Fruits ellipsoid, 3-5 cm long Horsfieldia subalpina subsp. kinabaluensis