Aster corymbiformis Rydb. (original description)
Aster griseolus Rydb. (original description)
Aster osterhoutii Rydb. accepted as Symphyotrichum lanceolatum (Willd.) G.L.Nesom (original description)
Aster tweedyi Rydb. accepted as Symphyotrichum foliaceum var. canbyi (A.Gray) G.L.Nesom (original description)
Aster underwoodii Rydb. (original description)
Chrysopsis alpicola Rydb. accepted as Heterotheca pumila (Greene) Semple (original description)
Chrysopsis amplifolia Rydb. accepted as Heterotheca fulcrata var. amplifolia (Rydb.) Semple (original description)
Chrysopsis caudata Rydb. accepted as Heterotheca fulcrata var. amplifolia (Rydb.) Semple (original description)
Chrysopsis horrida Rydb. accepted as Heterotheca villosa var. nana (A.Gray) Semple (original description)
Chrysothamnus newberryi Rydb. accepted as Ericameria parryi var. attenuata (M.E.Jones) G.L.Nesom & G.I.Baird (original description)
Chrysothamnus patens Rydb. accepted as Ericameria nauseosa var. oreophila (A.Nelson) G.L.Nesom & G.I.Baird (original description)
Coleosanthus albicaulis Rydb. accepted as Brickellia californica (Torr. & A.Gray) A.Gray (original description)
Coleosanthus reniformis (A.Gray) Rydb. accepted as Brickellia californica (Torr. & A.Gray) A.Gray (original description)
Grindelia aphanactis Rydb. accepted as Grindelia squarrosa (Pursh) Dunal (original description)
Grindelia serrulata Rydb. accepted as Grindelia squarrosa (Pursh) Dunal (original description)
Gutierrezia linearis Rydb. accepted as Gutierrezia sarothrae (Pursh) Britton & Rusby (original description)
Gutierrezia scoparia Rydb. accepted as Gutierrezia sarothrae (Pursh) Britton & Rusby (original description)
Hymenoxys canescens var. biennis Cockerell (original description)
Hymenoxys chrysanthemoides subsp. mearnsii Cockerell (original description)
Hymenoxys chrysanthemoides subsp. multiflora Cockerell (original description)
Hymenoxys chrysanthemoides subsp. osterhoutii Cockerell (original description)
Hymenoxys cooperi (A.Gray) Cockerell (original description)
Hymenoxys cooperi var. argyrea Cockerell (original description)
Hymenoxys davidsonii Cockerell (original description)
Hymenoxys earlei (Cockerell) Cockerell (original description)
Hymenoxys floribunda (A.Gray) Cockerell accepted as Hymenoxys richardsonii var. floribunda (A.Gray) K.F.Parker (original description)
Hymenoxys floribunda subsp. utilis (Cockerell) Cockerell (original description)
Hymenoxys floribunda var. arizonica Cockerell (original description)
Hymenoxys helenioides (Rydb.) Cockerell (original description)
Hymenoxys latissima Cockerell (original description)
Hymenoxys lemmonii (Greene) Cockerell (original description)
Hymenoxys lemmonii subsp. greenei Cockerell (original description)
Hymenoxys olivacea Cockerell (original description)
Hymenoxys richardsonii (Hook.) Cockerell (original description)
Hymenoxys richardsonii var. liguliflora (A.Nelson) Cockerell (original description)
Hymenoxys richardsonii var. macrantha (A.Nelson) Cockerell (original description)
Hymenoxys richardsonii var. nelsonii Cockerell (original description)
Hymenoxys richardsonii var. pumila (Greene) Cockerell (original description)
Hymenoxys rusbyi (A.Gray) Cockerell (original description)
Hymenoxys subg. Phileozera (Buckley) Cockerell (original description)
Hymenoxys subg. Picradenia (Hook.) Cockerell (original description)
Hymenoxys subintegra Cockerell (original description)
Hymenoxys texana (J.M.Coult. & Rose) Cockerell (original description)
Hymenoxys vaseyi (A.Gray) Cockerell (original description)
Picradenia intermedia A.Heller (original description)
Senecio fendleri var. lanatus Osterh. (original description)
Sideranthus annuus Rydb. accepted as Rayjacksonia annua (Rydb.) R.L.Hartm. & M.A.Lane (original description)