Ambrosia absynthyfolia Michx. accepted as Ambrosia polystachya DC. (original description)
Ambrosia bidentata Michx. (original description)
Ambrosia paniculata Michx. accepted as Ambrosia artemisiifolia L. (original description)
Artemisia canadensis Michx. accepted as Artemisia campestris subsp. canadensis (Michx.) Scoggan (original description)
Artemisia caudata Michx. accepted as Artemisia campestris L. (original description)
Aster acuminatus Michx. accepted as Oclemena acuminata (Michx.) Greene (original description)
Aster amplexicaulis Michx. accepted as Symphyotrichum patens var. patens (Aiton) G.L.Nesom (original description)
Aster argenteus Michx. accepted as Symphyotrichum sericeum (Vent.) G.L.Nesom (original description)
Aster biflorus Michx. accepted as Eurybia radula (Sol. ex Aiton) G.L.Nesom (original description)
Aster cordifolius Michx. (original description)
Aster coridifolius Michx. accepted as Symphyotrichum dumosum var. dumosum (L.) G.L.Nesom (original description)
Aster diversifolius Michx. accepted as Symphyotrichum undulatum (L.) G.L.Nesom (original description)
Aster infirmus Michx. accepted as Doellingeria infirma (Michx.) Greene (original description)
Aster marylandicus Michx. accepted as Sericocarpus conyzoides Nees (original description)
Aster sparsiflorus Michx. accepted as Symphyotrichum dumosum (L.) G.L.Nesom (original description)
Aster subulatus Michx. (original description)
Aster surculosus Michx. accepted as Eurybia surculosa (Michx.) G.L.Nesom (original description)
Aster tortifolius Michx. accepted as Sericocarpus tortifolius (Michx.) Nees (original description)
Aster tradescanti Michx. (original description)
Aster uniflorus Michx. accepted as Oclemena nemoralis (Aiton) Greene (original description)
Aster villosus Michx. accepted as Symphyotrichum pilosum var. pilosum (Willd.) G.L.Nesom (original description)
Baccharis angustifolia Michx. (original description)
Baccharis sessiliflora Michx. accepted as Baccharis glomeruliflora Pers. (original description)
Bellis integrifolia Michx. accepted as Astranthium integrifolium (Michx.) Nutt. (original description)
Bidens chrysanthemoides Michx. accepted as Bidens laevis (L.) Britton, Sterns & Poggenb. (original description)
Chrysocoma capillacea Michx. accepted as Eupatorium capillifolium (Lam.) Small ex Porter & Britton (original description)
Chrysocoma coronopifolia (Willd.) Michx. accepted as Eupatorium compositifolium Walter (original description)
Chrysocoma nudata Michx. accepted as Bigelowia nudata var. nudata (original description)
Cirsium horridulum Michx. (original description)
Cirsium muticum Michx. (original description)
Cirsium repandum Michx. (original description)
Cirsium virginianum (L.) Michx. (original description)
Conyza marilandica Michx. accepted as Pluchea camphorata (L.) DC. (original description)
Conyza pycnostachya Michx. accepted as Pterocaulon pycnostachyum (Michx.) Elliott (original description)
Coreopsis aristosa Michx. accepted as Bidens aristosa (Michx.) Britton (original description)
Coreopsis dichotoma Michx. accepted as Coreopsis gladiata Walter (original description)
Coreopsis lanceolata var. glabella Michx. accepted as Coreopsis lanceolata L. (original description)
Coreopsis lanceolata var. villosa Michx. (original description)
Coreopsis senifolia Michx. accepted as Coreopsis major Walter (original description)
Coreopsis trichosperma Michx. accepted as Bidens trichosperma (Michx.) Britton (original description)
Coreopsis verticillata var. linearis Michx. (original description)
Coreopsis verticillata var. tenuifolia Michx. (original description)
Doronicum nudicaule Michx. accepted as Arnica acaulis (Walter) Britton, Sterns & Poggenb. (original description)
Eclipta brachypoda Michx. accepted as Eclipta prostrata (L.) L. (original description)
Eclipta procumbens Michx. accepted as Eclipta prostrata (L.) L. (original description)
Erigeron divaricatus Michx. accepted as Conyza ramosissima Cronquist (original description)
Erigeron hyssopifolius Michx. (original description)
Erigeron nudicaulis Michx. accepted as Erigeron vernus (L.) Torr. & A.Gray (original description)
Erigeron philadelphicus Michx. accepted as Erigeron quercifolius Pursh (original description)
Erigeron pulchellus Michx. (original description)
Eupatorium connatum Michx. accepted as Eupatorium perfoliatum L. (original description)
Eupatorium falcatum Michx. accepted as Eutrochium purpureum var. purpureum (original description)
Eupatorium glandulosum Michx. accepted as Eupatorium album var. album L. (original description)
Eupatorium linearifolium Michx. accepted as Eupatorium hyssopifolium L. (original description)
Eupatorium serotinum Michx. (original description)
Eupatorium verbenifolium Michx. accepted as Eupatorium pilosum Walter (original description)
Gaillardia fimbriata Michx. accepted as Helenium fimbriatum (Michx.) A.Gray (original description)
Gaillardia lanceolata Michx. accepted as Gaillardia aestivalis (Walter) H.Rock (original description)
Gnaphalium dioicum var. plantaginifolium (L.) Michx. accepted as Antennaria plantaginifolia (L.) Richardson (original description)
Gnaphalium polycephalum Michx. (original description)
Helianthus atrorubens Michx. (original description)
Helianthus canescens Michx. (original description)
Helianthus divaricatus Michx. (original description)
Helianthus gigas Michx. (original description)
Helianthus tomentosus Michx. accepted as Helianthus tuberosus L. (original description)
Hieracium canadense Michx. (original description)
Hieracium gronovii var. foliosum Michx. accepted as Hieracium gronovii L. (original description)
Hieracium gronovii var. nudicaule Michx. (original description)
Hieracium scabrum Michx. accepted as Pilosella verruculata subsp. verruculata (Link) Soják (original description)
Hyoseris amplexicaulis Michx. accepted as Krigia biflora (Walter) S.F.Blake (original description)
Hyoseris angustifolia Michx. accepted as Krigia dandelion (L.) Nutt. (original description)
Hyoseris montana Michx. accepted as Krigia montana (Michx.) Nutt. (original description)
Inula gossypina Michx. accepted as Chrysopsis gossypina subsp. gossypina (Michx.) Elliot (original description)
Inula graminifolia Michx. accepted as Pityopsis graminifolia (Michx.) Nutt. (original description)
Iva annua Michx. (original description)
Lactuca graminifolia Michx. (original description)
Lactuca longifolia Michx. (original description)
Liatris aspera Michx. (original description)
Liatris bellidifolia Michx. accepted as Carphephorus bellidifolius (Michx.) Torr. & A.Gray (original description)
Liatris cylindracea Michx. (original description)
Liatris macrostachya Michx. (original description)
Liatris paniculata (J.F.Gmel.) Michx. accepted as Trilisa paniculata (J.F.Gmel.) Cass. (original description)
Liatris pycnostachya Michx. (original description)
Liatris sphaeroides Michx. (original description)
Liatris squarrulosa Michx. (original description)
Liatris tomentosa Michx. accepted as Carphephorus tomentosus (Michx.) Torr. & A.Gray (original description)
Melananthera Michx. accepted as Melanthera Rohr (original description)
Melanthera deltoidea Michx. accepted as Melanthera nivea (L.) Small (original description)
Melanthera hastata Michx. accepted as Melanthera nivea (L.) Small (original description)
Persoonia Michx. accepted as Marshallia Schreb. (original description)
Persoonia angustifolia Michx. accepted as Marshallia graminifolia (Walter) Small (original description)
Persoonia lanceolata Michx. accepted as Marshallia obovata (Walter) Beadle & F.E.Boynton (original description)
Persoonia latifolia Michx. accepted as Marshallia trinervia (Walter) Trel. (original description)
Prenanthes aspera Michx. accepted as Nabalus asper (Michx.) Torr. & A.Gray (original description)
Prenanthes crepidinea Michx. accepted as Nabalus crepidineus (Michx.) DC. (original description)
Prenanthes racemosa Michx. accepted as Nabalus racemosus (Michx.) Hook. (original description)
Prenanthes virgata Michx. accepted as Prenanthes autumnalis Walter (original description)
Rudbeckia chrysomela Michx. (original description)
Rudbeckia spathulata Michx. accepted as Rudbeckia fulgida var. spathulata (Michx.) Perdue (original description)
Scorzonera pinnatifida Michx. accepted as Pyrrhopappus carolinianus (Walter) DC. (original description)