| Parosela neomexicana (A. Gray) A. Heller, 1900 |
| Parosela nutans (Cav.) Rose, 1905 |
| Parosela occidentalis Rydb., 1920 |
| Parosela oculata Rydb., 1919 |
| Parosela orcuttii (S. Watson) Parish, 1913 |
| Parosela ordiae (A. Gray) C. Heller, 1900 |
| Parosela painteri Rose, 1906 |
| Parosela palmeri Rose, 1905 |
| Parosela peninsularis Rose, 1905 |
| Parosela pilifera Rydb., 1920 |
| Parosela pilosa Rydb., 1919 |
| Parosela platyphylla Rydb., 1920 |
| Parosela plumosa (S. Watson) Rose, 1906 |
| Parosela pogonathera A. Heller, 1894 |
| Parosela polygonoides (A. Gray) A. Heller, 1900 |
| Parosela polyphylla (M. Martens & Galeotti) Rose, 1906 |
| Parosela porteri A. Nelson, 1901 |
| Parosela pringlei (A. Gray) A. Heller, 1900 |
| Parosela procumbens (Sessé & Moc. ex DC.) Rose, 1905 |
| Parosela pueblensis (Brandegee) Rydb., 1919 |