Adopogon carolinianus (Walter) Britton accepted as Krigia virginica (L.) Willd. (original description)
Aster ericoides var. depauperatus (Fernald) Porter accepted as Symphyotrichum depauperatum (Fernald) G.L.Nesom (original description)
Aster ericoides var. pilosus (Willd.) Porter accepted as Symphyotrichum pilosum (Willd.) G.L.Nesom (original description)
Aster faxonii Porter accepted as Symphyotrichum pilosum (Willd.) G.L.Nesom (original description)
Aster laevis var. amplifolius Porter accepted as Symphyotrichum laeve (L.) Á.Löve & D.Löve (original description)
Aster lateriflorus var. grandis Porter accepted as Symphyotrichum lateriflorum (L.) Á.Löve & D.Löve (original description)
Aster lateriflorus var. hirsuticaulis (Lindl. ex DC.) Porter accepted as Symphyotrichum lateriflorum var. lateriflorum (L.) Á.Löve & D.Löve (original description)
Aster lowrieanus var. bicknellii Porter accepted as Symphyotrichum cordifolium (L.) G.L.Nesom (original description)
Aster lowrieanus var. lancifolius (Porter) Porter accepted as Symphyotrichum cordifolium (L.) G.L.Nesom (original description)
Aster major (Hook.) Porter accepted as Canadanthus modestus (Lindl.) G.L.Nesom (original description)
Aster majus (Hook.) Porter accepted as Canadanthus modestus (Lindl.) G.L.Nesom (original description)
Aster prenanthoides var. porrectifolius Porter (original description)
Aster radula var. biflorus (Michx.) Porter accepted as Eurybia radula (Sol. ex Aiton) G.L.Nesom (original description)
Brauneria pallida Britton (original description)
Brauneria pallida (Nutt.) Britton accepted as Echinacea pallida (Nutt.) Nutt. (original description)
Brauneria purpurea (L.) Britton accepted as Echinacea purpurea (L.) Moench (original description)
Carduus hillii (Canby) Porter accepted as Cirsium pumilum var. hillii (Canby) (original description)
Carduus odoratus (Barton) Porter accepted as Cirsium pumilum (Nutt.) Spreng. (original description)
Carduus pitcheri (Torr. ex Eaton) Porter accepted as Cirsium pitcheri (Torr. ex Eaton) Torr. & A.Gray (original description)
Carduus spinosissimus var. elliottii (Torr. & A.Gray) Porter accepted as Cirsium horridulum Michx. (original description)
Carduus undulatus var. canescens (Nutt.) Porter accepted as Cirsium canescens Nutt. (original description)
Chondrophora engelmannii (A.Gray) Britton accepted as Oonopsis engelmannii (A.Gray) Greene (original description)
Chondrophora howardii (Parry ex A.Gray) Britton accepted as Ericameria parryi var. howardii (Parry ex A.Gray) G.L.Nesom & G.I.Baird (original description)
Chondrophora nauseosa (Pall. ex Pursh) Britton accepted as Ericameria nauseosa (Pall. ex Pursh) G.L.Nesom & G.I.Baird (original description)
Chondrophora nauseosa var. glabrata (A.Gray) Rydb. ex Porter & Britton accepted as Ericameria nauseosa var. graveolens (Nutt.) Reveal & Schuyler (original description)
Chondrophora nauseosa var. glabrata (A.Gray) Rydb. accepted as Ericameria nauseosa var. graveolens (Nutt.) Reveal & Schuyler (original description)
Chondrophora nudata (Michx.) Britton accepted as Bigelowia nudata var. nudata (original description)
Chondrophora nudata var. virgata (Nutt.) Britton accepted as Bigelowia nudata var. nudata (original description)
Chrysopsis nuttallii Britton accepted as Bradburia pilosa (Nutt.) Semple (original description)
Chrysopsis pilosa (Walter) Britton accepted as Chrysopsis gossypina subsp. gossypina (Michx.) Elliot (original description)
Erigeron subtrinervis Rydb. ex Porter & Britton (original description)
Eriocarpum rubiginosum (Torr. & A.Gray) Britton accepted as Haplopappus rubiginosus Torr. & A.Gray (original description)
Eupatorium capillifolium (Lam.) Small ex Porter & Britton (original description)
Eupatorium capillifolium Small (original description)
Eupatorium maculatum var. amoenum (Pursh) Britton accepted as Eutrochium purpureum var. purpureum (original description)
Eupatorium purpureum var. falcatum (Michx.) Britton accepted as Eutrochium purpureum var. purpureum (original description)
Euthamia caroliniana (L.) Greene accepted as Euthamia caroliniana (L.) Greene ex Porter & Britton (original description)
Euthamia caroliniana (L.) Greene ex Porter & Britton (original description)
Euthamia leptocephala (Torr. & A.Gray) Greene (original description)
Filago prolifera (Nutt. ex DC.) Britton accepted as Diaperia prolifera (Nutt. ex DC.) Nutt. (original description)
Gaertneria acanthicarpa (Hook.) Britton accepted as Ambrosia acanthicarpa Hook. (original description)
Helianthus petiolaris var. canus Britton accepted as Helianthus niveus subsp. canescens (A.Gray) Heiser (original description)
Helianthus petiolaris var. patens (Lehm.) Rydb. ex Porter & Britton (original description)
Hymenopappus carolinensis (Lam.) Porter accepted as Hymenopappus scabiosaeus var. scabiosaeus L'Hér. (original description)
Lacinaria graminifolia var. pilosa (Aiton) Britton accepted as Liatris pilosa (Aiton) Willd. (original description)
Lacinaria spicata var. albiflora (Britton) Britton (original description)
Lacinaria spicata var. pumila (Lodd.) Porter (original description)
Lactuca spicata var. integrifolia Britton (original description)
Leontodon nudicaulis (L.) Porter accepted as Leontodon crispus Vill. (original description)
Leontodon nudicaulis Porter. (original description)
Marshallia trinervis (Walter) Porter accepted as Marshallia trinervia (Walter) Trel. (original description)
Matricaria grandiflora (Hook.) Britton accepted as Tripleurospermum maritimum subsp. phaeocephalum (Rupr.) Hämet-Ahti accepted as Tripleurospermum hookeri Sch.Bip. accepted as Tripleurospermum maritimum subsp. phaeocephalum (Rupr.) Hämet-Ahti (original description)
Matricaria matricarioides (Less.) Porter (original description)
Ptilepida linearifolia (Hook.) Britton accepted as Tetraneuris linearifolia (Hook.) Greene (original description)
Ptilepida odorata (DC.) Britton accepted as Hymenoxys odorata DC. (original description)
Ptilepida scaposa (DC.) Britton accepted as Hymenoxys scaposa (DC.) K.F.Parker accepted as Tetraneuris scaposa (DC.) Greene (original description)
Senecio compactus (A.Gray) Rydb. (original description)
Senecio compactus (A.Gray) Rydb. ex Porter & Britton accepted as Packera tridenticulata (Rydb.) W.A.Weber & Á.Löve (original description)
Sericocarpus bifoliatus (Walter) Porter accepted as Sericocarpus tortifolius (Michx.) Nees (original description)
Solidago rigidiuscula (Torr. & A.Gray) Porter (original description)
Solidago uniligulata (DC.) Porter accepted as Solidago uliginosa Nutt. (original description)
Solidago virgaurea var. deanei Porter (original description)
Taraxacum taraxacum var. alpinum (Koch) Porter (original description)
Townsendia exscapa (Richardson) Porter (original description)
Vernonia glauca Britton (original description)
Vernonia noveboracensis var. tomentosa Britton (original description)