Begonia lacunosa Warburg
A very nice African species of the Scutobegonia section. We can see it in all equatorial Africa. The blade is always bullate but has very varied form and color. Flowers are usually yellow but sometimes, white. This photo shows one from the Doussala area, by the Moukalaba-Doudou park, in south Gabon. It grows usually on slopes or rocks, sometimes on the ground, in forest and near the streams.