Agoseris californica (Nutt.) Hoover accepted as Agoseris heterophylla (Nutt.) Greene (original description)
Baccharis plummerae subsp. glabrata Hoover (original description)
Chaenactis lanosa var. denudata (Nutt.) Hoover accepted as Chaenactis glabriuscula var. lanosa (DC.) H.M.Hall (original description)
Cirsium occidentale var. compactum Hoover (original description)
Ericameria ericoides f. blakei (C.B.Wolf) Hoover accepted as Ericameria ericoides (Less.) Nutt. ex Jeps. (original description)
Ericameria ericoides var. pachylepis (H.M.Hall) Hoover accepted as Ericameria palmeri var. pachylepis (H.M.Hall) G.L.Nesom (original description)
Haplopappus stenolepis (H.M.Hall) Hoover (original description)
Hazardia stenolepis Hoover (original description)
Helenium puberulum var. bigelovii (A.Gray) Hoover (original description)
Hemizonia paniculata subsp. cruzensis Hoover (original description)
Hemizonia paniculata subsp. foliosa Hoover accepted as Hemizonia paniculata A.Gray accepted as Deinandra paniculata (A.Gray) Davidson & Moxley (original description)
Hemizonia parryi var. congdonii (B.L.Rob. & Greenm.) Hoover accepted as Centromadia parryi subsp. congdonii (B.L.Rob. & Greenm.) B.G.Baldwin (original description)
Lasthenia macrantha var. bakeri (J.T.Howell) Hoover accepted as Lasthenia californica subsp. bakeri (J.T.Howell) R.Chan (original description)
Layia pentachaeta var. albida (D.D.Keck) Hoover accepted as Layia pentachaeta subsp. albida D.D.Keck (original description)
Microseris douglasii var. tenella (A.Gray) Hoover accepted as Microseris douglasii subsp. tenella (A.Gray) K.L.Chambers (original description)
Solidago guiradonis var. luxurians (H.M.Hall) Hoover accepted as Solidago confinis A.Gray (original description)