| Oldenlandia caerulea (L.) A.Gray | Houstonia caerulea L. |
| Oldenlandia chlorophylla (Hochst.) Kuntze | Agathisanthemum chlorophyllum (Hochst.) Bremek. |
| Oldenlandia purpurea (L.) A.Gray | Houstonia purpurea L. |
| Oldenlandia purpurea longifolia (Gaertn.) A.Gray | Houstonia longifolia Gaertn. |
| Oldenlandia rubra (Cav.) A.Gray | Houstonia rubra Cav. |
| Oldenlandia serpyllifolia (Michx.) A.Gray | Houstonia serpyllifolia Michx. |
| Oldenlandia uniflora repens Reiche | Leptostigma arnottianum Walp. |