| Puccinia baccharidis Dietel & Holw., 1893 |
| Puccinia baccharidis-multiflorae Dietel Holw., 1901 |
| Puccinia badia Howl., 1905 |
| Puccinia ballotiflora Long, 1902 |
| Puccinia bella J. F. Hennen & Cummins, 1973 |
| Puccinia berberidis-trifoliae Dietel & Holw., 1901 |
| Puccinia biporula J. W. Baxter, 1952 |
| Puccinia blasdalei Dietel & Howl., 1893 |
| Puccinia blyttiana Lagerh., 1892 |
| Puccinia bomareae Henn., 1896 |
| Puccinia boutelouae (H.S. Jenn.) Holw., 1905 |
| Puccinia bulbilipes J. F. Hennen & Cummins, 1973 |
| Puccinia caborcensis Parmelee, 1969 |
| Puccinia cacabata Arthur & Holw., 1925 |
| Puccinia calanticariae Parmelee, 1968 |
| Puccinia caleae Arthur, 1905 |
| Puccinia californica Dietel, 1893 |
| Puccinia calochorti Peck, 1881 |
| Puccinia caricina DC., 1815 |
| Puccinia caricis-polystachyae Dietel, 1906 |