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CCDB → Angiosperms → Loasaceae → Petalonyx
| Taxon name | Status | Median (n) |
| Petalonyx linearis Greene | Accepted | 23 |
| Petalonyx nitidus S. Watson | Accepted | 23 |
| Petalonyx parryi A. Gray | Accepted | 23 |
| Petalonyx thurberi subsp. thurberi | Synonym of Petalonyx thurberi A. Gray | 23 |