Arnica latifolia var. viscidula A.Gray accepted as Arnica ovata Greene (original description)
Artemisia norvegica var. pacifica A.Gray accepted as Artemisia borealis subsp. richardsoniana (Besser) Korobkov (original description)
Aster campestris var. bloomeri (A.Gray) A.Gray accepted as Symphyotrichum campestre (Nutt.) G.L.Nesom (original description)
Aster canescens var. tephrodes A.Gray accepted as Dieteria asteroides var. asteroides Torr. (original description)
Aster canescens var. viridis A.Gray accepted as Dieteria canescens var. glabra (A.Gray) D.R.Morgan & R.L.Hartm. (original description)
Aster cusickii var. lyallii A.Gray accepted as Symphyotrichum hendersonii (Fernald) G.L.Nesom (original description)
Aster diffusus var. bifrons (Lindl. ex DC.) A.Gray accepted as Symphyotrichum lateriflorum (L.) Á.Löve & D.Löve (new combination reference)
Aster diffusus var. hirsuticaulis (Lindl. ex DC.) A.Gray (original description)
Aster ericoides var. reevesii A.Gray accepted as Symphyotrichum ericoides (L.) G.L.Nesom (original description)
Aster foliaceus var. eatonii A.Gray accepted as Symphyotrichum eatonii (A.Gray) G.L.Nesom (original description)
Aster foliaceus var. frondeus A.Gray accepted as Symphyotrichum foliaceum var. parryi (D.C.Eaton) G.L.Nesom (original description)
Aster foliaceus var. parryi A.Gray accepted as Symphyotrichum foliaceum var. parryi (D.C.Eaton) G.L.Nesom (original description)
Aster lindleyanus var. ciliolatus (Lindl.) A.Gray accepted as Symphyotrichum ciliolatum (Lindl.) Á.Löve & D.Löve (original description)
Aster novi-belgii var. laevigatus (Lam.) A.Gray accepted as Symphyotrichum novi-belgii (L.) G.L.Nesom (original description)
Aster novi-belgii var. litoreus A.Gray accepted as Symphyotrichum praealtum var. praealtum (Poir.) G.L.Nesom (original description)
Aster novi-belgii var. thyrsiflorus (Hoffm.) A.Gray accepted as Symphyotrichum novi-belgii (L.) G.L.Nesom (original description)
Aster oblongifolius var. rigidulus A.Gray accepted as Symphyotrichum oblongifolium (Nutt.) G.L.Nesom (original description)
Aster puniceus var. lucidulus A.Gray (original description)
Aster salicifolius var. subasper (Lindl. ex Hook.) A.Gray accepted as Symphyotrichum praealtum var. subasperum (Lindl.) G.L.Nesom (original description)
Aster tanacetifolius var. pygmaeus (A.Gray) A.Gray accepted as Arida parviflora (A.Gray) D.R.Morgan & R.L.Hartm. (original description)
Baeria gracilis var. tenerrima (DC.) A.Gray accepted as Lasthenia californica DC. ex Lindl. (original description)
Balsamorhiza hookeri var. incana (Nutt.) A.Gray accepted as Balsamorhiza incana Nutt. (original description)
Berlandiera lyrata var. macrophylla A.Gray accepted as Berlandiera macrophylla (A.Gray) M.E.Jones (original description)
Bigelowia douglasii var. lanceolata (Nutt.) A.Gray accepted as Chrysothamnus viscidiflorus subsp. lanceolatus (Nutt.) H.M.Hall & Clem. (original description)
Bigelowia douglasii var. pumila (Nutt.) A.Gray accepted as Chrysothamnus viscidiflorus subsp. viscidiflorus (Hook.) Nutt. (original description)
Bigelowia wrightii var. hirtella (A.Gray) A.Gray accepted as Isocoma pluriflora (Torr. & A.Gray) Greene (original description)
Boltonia latisquama var. occidentalis A.Gray accepted as Boltonia asteroides var. recognita (Fernald & Griscom) Cronquist (original description)
Brickellia wislizeni var. lanceolata A.Gray accepted as Brickellia amplexicaulis B.L.Rob. (original description)
Chrysopsis villosa var. discoidea A.Gray accepted as Heterotheca villosa var. minor (Hook.) Semple (original description)
Chrysopsis villosa var. echioides (Benth.) A.Gray accepted as Heterotheca sessiliflora subsp. echioides (Benth.) Semple (original description)
Chrysopsis villosa var. sessiliflora (Nutt.) A.Gray accepted as Heterotheca sessiliflora (Nutt.) Shinners (original description)
Conyza coulteri var. tenuisecta A.Gray accepted as Laennecia sophiifolia (Kunth) G.L.Nesom (original description)
Coreopsis drummondii var. wrightii A.Gray accepted as Coreopsis wrightii (A.Gray) H.M.Parker (original description)
Coreopsis leavenworthii var. garberi A.Gray (original description)
Coreopsis trichosperma var. tenuiloba A.Gray accepted as Bidens trichosperma (Michx.) Britton (original description)
Crepis intermedia var. gracilis (D.C.Eaton) A.Gray accepted as Crepis atribarba A.Heller (original description)
Encelia eriocephala var. paniculata A.Gray accepted as Geraea canescens Torr. & A.Gray (original description)
Erigeron acris var. debilis A.Gray accepted as Erigeron nivalis Nutt. (original description)
Erigeron strigosus var. beyrichii Torr. & A.Gray ex A.Gray accepted as Erigeron strigosus var. strigosus Muhl. ex Willd. (original description)
Eupatorium aromaticum var. melissoides (Willd.) A.Gray accepted as Ageratina aromatica (L.) Spach (original description)
Eupatorium betonicum var. subintegrum A.Gray accepted as Conoclinium betonicifolium (Mill.) R.M.King & H.Rob. (original description)
Eupatorium hyssopifolium var. laciniatum A.Gray (original description)
Eupatorium hyssopifolium var. tortifolium (Chapm.) A.Gray (original description)
Eupatorium occidentale var. arizonicum A.Gray accepted as Ageratina herbacea (A.Gray) R.M.King & H.Rob. (original description)
Eupatorium rotundifolium var. scabridum (Elliott) A.Gray (original description)
Eupatorium semiserratum var. lancifolium (Torr. & A.Gray) A.Gray accepted as Eupatorium lancifolium (Torr. & A.Gray) Small (original description)
Evax caulescens var. minima A.Gray accepted as Hesperevax acaulis (Kellogg) Greene (original description)
Evax multicaulis var. drummondii (Torr. & A.Gray) A.Gray accepted as Diaperia verna var. drummondii (Torr. & A.Gray) Morefield (original description)
Gutierrezia euthamiae var. microcephala (DC.) A.Gray accepted as Gutierrezia microcephala (DC.) A.Gray (original description)
Haplopappus racemosus var. stenocephalus A.Gray (original description)
Haplopappus rubiginosus var. phyllocephalus (DC.) A.Gray (original description)
Helianthella quinquenervis var. arizonica A.Gray (original description)
Helianthus californicus var. mariposianus A.Gray (original description)
Helianthus californicus var. utahensis (D.C.Eaton) A.Gray (original description)
Helianthus decapetalus var. multiflorus (L.) A.Gray (original description)
Helianthus tuberosus var. subcanescens A.Gray accepted as Helianthus tuberosus L. (original description)
Hemizonia fasciculata var. lobbii (Greene) A.Gray (original description)
Hemizonia fasciculata var. ramosissima (Benth.) A.Gray accepted as Hemizonia fasciculata (DC.) Torr. & A.Gray accepted as Deinandra fasciculata (DC.) Greene (original description)
Hemizonia multiglandulosa var. cephalotes (DC.) A.Gray accepted as Calycadenia multiglandulosa DC. (original description)
Hemizonia multiglandulosa var. sparsa A.Gray accepted as Calycadenia fremontii A.Gray (original description)
Hemizonia plumosa var. subplumosa A.Gray accepted as Blepharizonia laxa Greene (original description)
Lactuca leucophaea var. integrifolia (Torr. & A.Gray) A.Gray (original description)
Lessingia nana var. caulescens A.Gray (original description)
Liatris acidota var. mucronata A.Gray (original description)
Liatris scariosa var. squarrulosa (Michx.) A.Gray accepted as Liatris squarrulosa Michx. (original description)
Liatris spicata var. montana A.Gray (original description)
Malacothrix saxatilis var. tenuifolia (Nutt.) A.Gray accepted as Malacothrix saxatilis (Nutt.) Torr. & A.Gray (original description)
Polymnia canadensis var. radiata A.Gray accepted as Polymnia canadensis L. (original description)
Prenanthes serpentaria var. barbata (Torr. & A.Gray) A.Gray accepted as Nabalus barbatus (Torr. & A.Gray) A.Heller (original description)
Prenanthes serpentaria var. nana (Bigelow) A.Gray accepted as Nabalus trifoliolatus Cass. (original description)
Rigiopappus leptocladus var. longiaristatus A.Gray (original description)
Rudbeckia triloba var. rupestris (Chick.) A.Gray (original description)
Senecio aureus var. subnudus (DC.) A.Gray accepted as Packera subnuda (DC.) Trock & T.M.Barkley (original description)
Senecio resedifolius var. columbiensis A.Gray (original description)
Senecio toluccanus var. microdontus A.Gray (original description)
Silphium trifoliatum var. latifolium A.Gray accepted as Silphium asteriscus var. latifolium (A.Gray) J.A. Clevinger (original description)
Solidago neglecta var. linoides (Torr. & A.Gray) A.Gray accepted as Solidago uliginosa Nutt. (original description)
Stevia plummerae var. alba A.Gray accepted as Stevia plummerae var. plummerae A.Gray (original description)
Taraxacum officinale var. scopulorum A.Gray (original description)
Townsendia sericea var. leptotes A.Gray accepted as Townsendia leptotes (A.Gray) Osterh. (original description)
Trixis angustifolia var. latiuscula A.Gray accepted as Trixis californica var. californica Kellogg (original description)
Vernonia noveboracensis var. latifolia A.Gray accepted as Vernonia glauca (L.) Willd. (original description)