Machaeranthera cognata (H.M.Hall) Cronquist & D.D.Keck accepted as Xylorhiza cognata (H.M.Hall) T.J.Watson (original description)
Machaeranthera frutescens (S.Watson) Cronquist & D.D.Keck accepted as Xylorhiza frutescens (S.Watson) Greene (original description)
Machaeranthera glabriuscula (Nutt.) Cronquist & D.D.Keck accepted as Xylorhiza glabriuscula Nutt. (original description)
Machaeranthera glabriuscula var. villosa (Nutt.) Cronquist & D.D.Keck accepted as Xylorhiza glabriuscula Nutt. (original description)
Machaeranthera grindelioides var. depressa (Maguire) Cronquist & D.D.Keck accepted as Xanthisma grindelioides var. depressum (Maguire) D.R.Morgan & R.L.Hartm. (original description)
Machaeranthera kingii (D.C.Eaton) Cronquist & D.D.Keck accepted as Herrickia kingii (D.C.Eaton) Brouillet, Urbatsch & R.P.Roberts (original description)
Machaeranthera lagunensis D.D.Keck accepted as Machaeranthera asteroides var. lagunensis (D.D.Keck) B.L.Turner (original description)
Machaeranthera orcuttii (Vasey & Rose) Cronquist & D.D.Keck accepted as Xylorhiza orcuttii (Vasey & Rose) Greene (original description)
Machaeranthera shastensis var. eradiata (A.Gray) Cronquist & D.D.Keck accepted as Dieteria canescens var. shastensis (A.Gray) D.R.Morgan & R.L.Hartm. (original description)
Machaeranthera shastensis var. glossophylla (Piper) Cronquist & D.D.Keck accepted as Dieteria canescens var. canescens (Pursh) Nutt. (original description)
Machaeranthera shastensis var. latifolia (Cronquist) Cronquist & D.D.Keck accepted as Dieteria canescens var. canescens (Pursh) Nutt. (original description)
Machaeranthera shastensis var. montana (Greene) Cronquist & D.D.Keck accepted as Dieteria canescens var. canescens (Pursh) Nutt. (original description)
Machaeranthera tortifolia (Torr. & A.Gray) Cronquist & D.D.Keck accepted as Xylorhiza tortifolia (Torr. & A.Gray) Greene (original description)
Machaeranthera venusta (M.E.Jones) Cronquist & D.D.Keck accepted as Xylorhiza venusta (M.E.Jones) A.Heller (original description)
Machaeranthera wrightii (A.Gray) Cronquist & D.D.Keck accepted as Xylorhiza wrightii (A.Gray) Greene (original description)