| Machaeranthera blephariphylla | Xanthisma blephariphylla (A.Gray) D.R.Morgan & R.L.Hartm. trib. Astereae |
| Machaeranthera coloradoensis | Xanthisma coloradoense (A.Gray) D.R.Morgan & R.L.Hartm. trib. Astereae |
| Machaeranthera confertifolia | Xylorhiza confertifolia (Cronquist) T.J.Watson trib. Astereae |
| Machaeranthera cronquistii | Xylorhiza cronquistii S.L.Welsh & N.D.Atwood trib. Astereae |
| Machaeranthera fremontii | Oönopsis foliosa (Torr. & A.Gray) Greene trib. Astereae |
| Machaeranthera glabriuscula | Xylorhiza glabriuscula Nutt. trib. Astereae |
| Machaeranthera grindelioides | Xanthisma grindelioides (Nutt.) D.R.Morgan & R.L.Hartm. trib. Astereae |
| Machaeranthera gypsitherma | Leucosyris blepharophylla (A.Gray) Pruski & R.L.Hartm. trib. Astereae |
| Machaeranthera linearifolia | Xylorhiza linearifolia (T.J.Watson) G.L.Nesom trib. Astereae |
| Machaeranthera setigera | Xanthisma blephariphylla (A.Gray) D.R.Morgan & R.L.Hartm. trib. Astereae |
| Machaeranthera venusta | Xylorhiza venusta A.Heller trib. Astereae |