Brickellia longifolia var. watsonii (B.L.Rob.) S.L.Welsh accepted as Brickellia watsonii B.L.Rob. (original description)
Chrysothamnus nauseosus var. abbreviatus (M.E.Jones) S.L.Welsh (original description)
Chrysothamnus nauseosus var. iridis (L.C.Anderson) S.L.Welsh accepted as Ericameria nauseosa var. iridis (L.C.Anderson) G.L.Nesom & G.I.Baird (original description)
Cirsium arizonicum var. nidulum (M.E.Jones) S.L.Welsh accepted as Cirsium arizonicum var. arizonicum (A.Gray) Petr. (original description)
Cirsium calcareum var. bipinnatum (Eastw.) S.L.Welsh accepted as Cirsium calcareum (M.E.Jones) Wooton & Standl. (original description)
Cirsium calcareum var. pulchellum (Greene ex Rydb.) S.L.Welsh accepted as Cirsium calcareum (M.E.Jones) Wooton & Standl. (original description)
Crepis occidentalis var. glauca (Nutt.) S.L.Welsh (original description)
Erigeron awapensis S.L.Welsh accepted as Erigeron abajoensis Cronquist (original description)
Erigeron canaani S.L.Welsh (original description)
Erigeron carringtoniae S.L.Welsh accepted as Erigeron untermannii S.L.Welsh & Goodrich (original description)
Erigeron goodrichii S.L.Welsh (original description)
Erigeron maguirei var. harrisonii S.L.Welsh accepted as Erigeron maguirei Cronquist (original description)
Erigeron speciosus var. mollis (A.Gray) S.L.Welsh accepted as Erigeron subtrinervis Rydb. ex Porter & Britton (original description)
Erigeron speciosus var. uintahensis (Cronquist) S.L.Welsh accepted as Erigeron uintahensis Cronquist (original description)
Erigeron untermannii S.L.Welsh & Goodrich (original description)
Erigeron wahwahensis S.L.Welsh accepted as Erigeron jonesii Cronquist (original description)
Gutierrezia petradoria (S.L.Welsh & Goodrich) S.L.Welsh (original description)
Gutierrezia pomariensis (S.L.Welsh) S.L.Welsh accepted as Gutierrezia sarothrae (Pursh) Britton & Rusby (original description)
Haplopappus armerioides var. gramineus S.L.Welsh & F.J.Sm. (original description)
Haplopappus crispus L.C.Anderson accepted as Ericameria crispa (L.C.Anderson) G.L.Nesom (original description)
Haplopappus zionis L.C.Anderson accepted as Ericameria zionis (L.C.Anderson) G.L.Nesom (original description)
Townsendia montana var. caelilinensis S.L.Welsh accepted as Townsendia montana M.E.Jones (original description)