Brickellia microphylla var. watsonii (B.L.Rob.) S.L.Welsh accepted as Brickellia watsonii B.L.Rob. (original description)
Chrysothamnus nauseosus var. glareosus (M.E.Jones) S.L.Welsh accepted as Ericameria nauseosa var. psilocarpa (S.F.Blake) G.L.Nesom & G.I.Baird (original description)
Cirsium undulatum var. tracyi (Rydb.) S.L.Welsh accepted as Cirsium tracyi (Rydb.) Petr. (original description)
Crepis runcinata subsp. runcinata var. glauca (Nutt.) S.L.Welsh accepted as Crepis runcinata subsp. glauca (Nutt.) Babc. & Stebbins (original description)
Crepis runcinata var. glauca (Nutt.) S.L.Welsh accepted as Crepis runcinata subsp. glauca (Nutt.) Babc. & Stebbins (original description)
Erigeron untermanniorum S.L.Welsh (original description)
Haplopappus armerioides var. gramineus S.L.Welsh & F.J.Sm. accepted as Stenotus armerioides var. gramineus (S.L.Welsh & F.J.Sm.) Kartesz & Gandhi (original description)
Haplopappus armerioides var. gramineus S.L.Welsh & F.J.Sm. (original description)
Haplopappus racemosus var. prionophyllus (Greene) S.L.Welsh accepted as Pyrrocoma racemosa var. paniculata (Nutt.) Kartesz & Gandhi (original description)
Haplopappus racemosus var. sessiliflorus (Greene) S.L.Welsh accepted as Pyrrocoma racemosa var. sessiliflora (Greene) Mayes ex G.K.Br. & D.J.Keil (original description)
Haplopappus watsonii var. rydbergii (S.F.Blake) S.L.Welsh accepted as Ericameria obovata (Rydb.) G.L.Nesom (original description)
Machaeranthera canescens var. commixta (Greene) S.L.Welsh accepted as Dieteria bigelovii var. commixta (Greene) D.R.Morgan & R.L.Hartm. (original description)
Machaeranthera canescens var. leucanthemifolia (Greene) S.L.Welsh accepted as Dieteria canescens var. leucanthemifolia (Greene) D.R.Morgan & R.L.Hartm. (original description)
Machaeranthera canescens var. vacans (A.Nelson) S.L.Welsh (original description)
Petradoria pumila var. graminea (Wooton & Standl.) S.L.Welsh accepted as Petradoria pumila subsp. graminea (Wooton & Standl.) L.C.Anderson (original description)