1Buds and flowers erect, the inflorescence erect or somewhat drooping.
1'Buds and flowers drooping, becoming erect in fruit.
2Stems pubescent only along conspicuously elevated lines running down from the margins of the petioles
2'Stems pubescent all around.
3Upper leaves strongly reduced. Inflorescence slightly nodding (Luzon).
3'Upper leaves not notably reduced. Inflorescence erect (Java, Lesser Sunda Is., New Guinea).
4Leaves ovate, 0.4-1.5 cm wide
4'Leaves very narrowly elliptic to linear, 0.1-0.5 cm wide
5Plants finely glandular-pubescent; leaves usually ericoid in appearance; petals purplish-rose
5'Plants densely strigulose; leaves broader, not ericoid; petals white or very pale pink
6Stems with elevated glabrous lines running from the center of each petiole and elevated pubescent lines from their angles; petals 7-14 mm long
6'Stems without elevated lines, uniformly pubescent all around; petals 2.5-8.5 mm long.
7Petals 6-8.5 mm long; seeds 1-1.4 mm long
7'Petals 2.5-5(-6) mm long; seeds 0.7-0.9 mm long