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CCDB → Angiosperms → Polygonaceae → Oxytheca
| Taxon name | Status | Median (n) |
| Oxytheca perfoliata Torr. & A. Gray | Accepted | 20 |
| Oxytheca watsonii Torr. & A. Gray | Accepted | 20 |
| Oxytheca parishii Parry | Synonym of Acanthoscyphus parishii (Parry) Small | 20 |
| Oxytheca dendroidea subsp. dendroidea | Synonym of Oxytheca dendroidea Nutt. | 20 |
| Oxytheca caryophylloides Parry | Synonym of Sidotheca caryophylloides (Parry) Reveal | 20 |
| Oxytheca trilobata A. Gray | Synonym of Sidotheca trilobata (A. Gray) Reveal | 20 |