1 | Bark of older twigs not or hardly longitudinally cracking, nor flaking. Twig apex coarsely rusty pubescent, striate or ridged, ± angled. [Male buds pear-shaped; staminal disc ± flat above.] — Palawan. |
1' | Bark of older twigs usually longitudinally cracking, later on (finely) flaking (not flaking in subsp. ridleyi forma nana). Twig apex variably hairy, striate or not, not angled. |
2 | Indumentum of twig apex and flowers dark brown. Male buds obconical or globose, often somewhat broader than long. Leaves usually large, 4-10 cm broad, drying dark (greenish) brown above, pale brown or grey-glaucous beneath. Fruits variable of size, with brown to rusty-reddish indumentum. — Peninsular Thailand and Malaysia, Bangka, Borneo. |
2' | Indumentum of twig apex and flowers pale or yellowish brown. Male buds obovoid. Leaves generally smaller, 11-22 by 2-5 cm, drying pale (greenish) brown above, whitish beneath. Fruits 1.4-2(-3.5) cm long, with pale or yellowish brown indumentum. — Borneo. |