| Cosmos longipetiolatus Melchert, 1967 |
| Cosmos mattfeldii Sherff, 1934 |
| Cosmos mcvaughii Sherff, 1964 |
| Cosmos modestus Sherff, 1937 |
| Cosmos montanus Sherff, 1932 |
| Cosmos nelsonii B.L. Rob. & Fernald, 1909 |
| Cosmos nitidus Paray, 1958 |
| Cosmos ocellatus Greenm., 1905 |
| Cosmos ochroleucoflorus Melchert, 1967 |
| Cosmos pacificus Melchert, 1990 |
| Cosmos pacificus var. chiapensis Melchert, 1990 |
| Cosmos pacificus var. pacificus Melchert, 1990 |
| Cosmos palmeri B.L. Rob., 1909 |
| Cosmos parviflorus (Jacq.) Kunth, 1818 |
| Cosmos parviflorus (Jacq.) Pers., 1807 |
| Cosmos pringlei B.L. Rob. & Fernald, 1909 |
| Cosmos pseudoperfoliatus Art. Castro, Harker & Aarón Rodr., 2013 |
| Cosmos purpureus (DC.) Benth. & Hook. f. ex Hemsl., 1881 |
| Cosmos ramirezianus Art. Castro, Harker & Aarón Rodr., 2013 |
| Cosmos scabiosoides Kunth, 1818 |