Key to the Thottea species in the Philippines
1. Stem puberolous; leaves glabrous on both sides; stamens arranged in 2 whorls; style column 5–7 mm long, lobes 4–6……………………………………….…….T. philippinensis Quisumb.
– Stem tomentose; leaves glabrous above, densely pubescent beneath; stamens arranged in 1 whorl; style column 2 mm long, lobes 3 (or 4)………………..T. tomentosa(Blume) Ding Hou