KEY TO THE SUBSPECIES

1Petiole 1.5-2(-2.5) mm thick. — Malay Peninsula, Borneo
1'Petiole 0.5-1 mm thick
2Lamina spathulate to oblanceolate to linear-lanceolate, drying greenish; lateral veins departing in acute angles, the midrib repeatedly branched in laminas with rounded apices. — Philippines (Palawan)
2'Lamina oblong to subobovate to linear-oblanceolate, mostly drying brown; lateral veins departing in broad angles in the middle of the lamina, the midrib simply branched in laminas with rounded apices. — Sumatra, Borneo, Philippines, Celebes