In arenosis prope Coquilhatville (Congo). VII. 1899 — No. 12597.
3. O. corymbosa L.
In arenosis inter Ibadan et Abeokuta (Yoruba-Land). III. 1899 — No. 13036.
4. O. Crepiniana K. Sch.
Inter frutices scandens prope Coquilhatville (Congo). VII. 1899 — No. 12622.
5. O. Heynei Oliv.
In insulis sabulosis fluminis Congo, in lacu „Stanley-Pool“ (Congo). VI. 1899 — No. 12572.
6. O. lancifolia Schweinf.
In collibus sabulosis inter Ibadan et Abeokuta (Yoruba-Land). III. 1899 — No. 12344.
7. O. virgata D. C.