This tree of rain forest is known commonly as the Rose Walnut or even more descriptively as the Domatia Tree, the latter name alluding to the large and obvious domatia occuring at the lateral nerve-midrib junctions at the underside of the leaves. The domatia cause a swelling that can be viewed even from the upper side of the leaf. In addition to this feature, the leaf underside is distinctively glaucous, hence the specific epithet ‘discolor’. Another similar species I’ve seen is Endiandra cowleyi, which has a similar leaf shape and domatia but the leaf undersides are green and glossy.
Leaf Whispering in the Tropics 