| Oonopsis engelmannii (A. Gray) Greene |
Accepted |
10 |
| Oonopsis foliosa var. monocephala (A. Nelson) Kartesz & Gandhi |
Accepted |
10 |
| Oonopsis multicaulis (Nutt.) Greene |
Accepted |
4 |
| Oonopsis wardii (A. Gray) Greene |
Accepted |
5 |
| Haplopappus engelmannii (A. Gray) H. M. Hall |
Synonym of Oonopsis engelmannii (A. Gray) Greene |
10 |
| Haplopappus fremontii subsp. fremontii |
Synonym of Oonopsis foliosa Greene |
10 |
| Oonopsis foliosa var. foliosa |
Synonym of Oonopsis foliosa Greene |
10 |
| Haplopappus fremontii subsp. monocephalus (A. Nelson) H. M. Hall |
Synonym of Oonopsis foliosa var. monocephala (A. Nelson) Kartesz & Gandhi |
10 |
| Oonopsis foliosa var. monocephala (A. Nelson) K. ＆. Grandhi |
Synonym of Oonopsis foliosa var. monocephala (A. Nelson) Kartesz & Gandhi |
10 |
| Haplopappus multicaulis (Nutt.) A. Gray |
Synonym of Oonopsis multicaulis (Nutt.) Greene |
4 |
| Haplopappus fremontii subsp. wardii (A. Gray) H. M. Hall |
Synonym of Oonopsis wardii (A. Gray) Greene |
5 |