| Ageratina atrocordata (B.L. Rob.) R.M. King & H. Rob., 1970 |
| Ageratina ayerscottiana B.L. Turner, 1995 |
| Ageratina barriei B.L. Turner, 1987 |
| Ageratina beamanii B.L. Turner, 1987 |
| Ageratina bellidifolia (Benth.) R.M. King & H. Rob., 1970 |
| Ageratina betulifolia (Greene) R.M. King & H. Rob., 1970 |
| Ageratina blepharilepis (Sch. Bip.) R.M. King & H. Rob., 1970 |
| Ageratina bobjansenii B.L. Turner, 1996 |
| Ageratina brandegeana (B.L. Rob.) R.M. King & H. Rob., 1970 |
| Ageratina breedlovei R.M. King & H. Rob., 1985 |
| Ageratina brevipes (DC.) R.M. King & H. Rob., 1970 |
| Ageratina bustamenta (DC.) R.M. King & H. Rob., 1970 |
| Ageratina calaminthifolia (Kunth) R.M. King & H. Rob., 1970 |
| Ageratina calophylla (Greene) R.M. King & H. Rob., 1970 |
| Ageratina campyloclada (B.L. Rob.) R.M. King & H. Rob., 1970 |
| Ageratina capillipes R.M. King & H. Rob., 1990 |
| Ageratina cardiophylla (B.L. Rob.) R.M. King & H. Rob., 1970 |
| Ageratina carmonis (Standl. & Steyerm.) R.M. King & H. Rob., 1981 |
| Ageratina cerifera (McVaugh) R.M. King & H. Rob., 1972 |
| Ageratina chapalensis (S. Watson) R.M. King & H. Rob., 1970 |