Opinions from L. J. Hickey 1977
- 'Aceraceae belongs to Sapindales'
- 'Acrovena belongs to Melastomataceae'
- 'Acrovena laevis belongs to Acrovena'
- 'Ampelopsis belongs to Vitaceae'
- 'Angiospermae belongs to Tracheophyta'
- 'Araceae belongs to Spathiflorae'
- 'Asplenium magnum is recombined as Hemitelia magna'
- 'Betula belongs to Betulaceae'
- 'Betula hesterna belongs to Betula'
- 'Betulaceae belongs to Fagales'
- 'Burseraceae belongs to Geraniales'
- 'Canariophyllum belongs to Burseraceae'
- 'Canariophyllum ampla belongs to Canariophyllum'
- 'Caprifoliaceae belongs to Rubiales'
- 'Carpites verrucosus is recombined as Porosia verrucosa'
- 'Carpolithes arcticus belongs to Carpolithes'
- 'Carpolithes bryangosus belongs to Carpolithes'
- 'Carpolithes horridus is recombined as Isoetites horridus'
- 'Carpolithes horridus is recombined as Isoetites horridus' according to Brown
- 'Carpolithes horridus is recombined as Isoetites horridus' according to Brown
- 'Carpolithes lunatus belongs to Carpolithes'
- 'Carya antiquorum belongs to Carya' according to Newberry 1868
- 'Cercidiphyllaceae belongs to Ranales'
- 'Cocculus belongs to Menispermaceae'
- 'Cocculus flabella belongs to Cocculus' according to Wolfe 1966
- 'Coniferales belongs to Gymnospermae'
- 'Cornaceae belongs to Umbelliflorae'
- 'Cornus hyperborea belongs to Cornus' according to Heer 1871
- 'Corylus belongs to Betulaceae'
- 'Corylus acutertiaria belongs to Corylus'
- 'Cunoniaceae belongs to Rosales'
- 'Cupressaceae belongs to Coniferales'
- 'Cyatheaceae belongs to Filicales'
- 'Cyperaceae belongs to Glumiflorae'
- 'Cyperacites belongs to Cyperaceae'
- 'Dicotyledones is corrected as Dicotyledoneae and belongs to Angiospermae'
- 'Dicotylophyllum belongs to Dicotyledoneae'
- 'Dicotylophyllum hamameloides belongs to Dicotylophyllum'
- 'Dicotylophyllum hebronensis belongs to Dicotylophyllum'
- 'Dicotylophyllum mercerensis belongs to Dicotylophyllum'
- 'Dicotylophyllum oblongatum belongs to Dicotylophyllum'
- 'Dombeya belongs to Sterculiaceae'
- 'Dombeya novimundi belongs to Dombeya'
- 'Equisetaceae belongs to Equisetales'
- 'Equisetales belongs to Sphenopsida'
- 'Equisetum magnum belongs to Equisetum'
- 'Ericaceae belongs to Ericales'
- 'Ericales is corrected as Ericales and belongs to Dicotyledoneae'
- 'Euphorbiaceae belongs to Geraniales'
- 'Fagales belongs to Dicotyledoneae'
- 'Filicales belongs to Filicinae'
- 'Filicinae belongs to Pteropsida'
- 'Geraniales belongs to Dicotyledoneae'
- 'Glumiflorae belongs to Monocotyledoneae'
- 'Glyptostrobus belongs to Taxodiaceae'
- 'Gymnospermae belongs to Tracheophyta'
- 'Ilex longifolia is recombined as Meliosma longifolia'
- 'Isoetaceae belongs to Isoetales'
- 'Isoetales belongs to Lycopsida'
- 'Isoetites belongs to Isoetaceae'
- 'Juglandaceae belongs to Juglandales'
- 'Juglandales belongs to Dicotyledoneae'
- 'Kalmia belongs to Ericaceae'
- 'Kalmia elliptica belongs to Kalmia' according to Brown 1962
- 'Lamanonia belongs to Cunoniaceae'
- 'Lamanonia borealis belongs to Lamanonia'
- 'Lauraceae belongs to Ranales'
- 'Lycopsida belongs to Tracheophyta'
- 'Lygodium kaulfussii is a misspelling of Lygodium kaulfussi'
- 'Lygodium kaulfusii is a misspelling of Lygodium kaulfussi'
- 'Malvales belongs to Dicotyledoneae'
- 'Melastomataceae belongs to Myrtiflorae'
- 'Menispermaceae belongs to Ranales'
- 'Menispermites belongs to Menispermaceae'
- 'Menispermites parvareolatus belongs to Menispermites'
- 'Metasequoia belongs to Taxodiaceae'
- 'Metasequoia occidentalis belongs to Metasequoia' according to Chaney 1951
- 'Monocotyledones was reranked as the subclass Monocotyledoneae and belongs to Angiospermae'
- 'Musophyllum complicatum belongs to Musophyllum' according to Lesquereux 1874
- 'Myrtiflorae belongs to Dicotyledoneae'
- 'Nelumbo belongs to Nymphaeaceae'
- 'Nelumbo aureavallis belongs to Nelumbo'
- 'Nymphaeaceae belongs to Ranales'
- 'Onoclea belongs to Polypodiaceae'
- 'Onoclea hesperia belongs to Onoclea' according to Brown 1962
- 'Osmunda belongs to Osmundaceae'
- 'Osmunda macrophylla belongs to Osmunda' according to Penhallow 1908
- 'Osmundaceae belongs to Filicales'
- 'Oxalidaceae belongs to Geraniales'
- 'Palmacites belongs to Palmae'
- 'Palmae belongs to Principes'
- 'Pandanales belongs to Monocotyledoneae'
- 'Paranymphaea belongs to Nymphaeaceae'
- 'Paranymphaea crassifolia belongs to Paranymphaea' according to Berry 1935
- 'Paraternstroemia belongs to Theaceae'
- 'Paraternstroemia hyphovenosa belongs to Paraternstroemia'
- 'Parietales belongs to Dicotyledoneae'
- 'Peltandra belongs to Araceae'
- 'Peltandrea primaeva is recombined as Peltandra primaeva'
- 'Penosphyllum belongs to Sterculiaceae'
- 'Persites belongs to Lauraceae'
- 'Persites argutus belongs to Persites'
- 'Pinaceae belongs to Coniferales'
- 'Pinus peregrinus belongs to Pinus'
- 'Planera microphylla is recombined as Chaetoptelea microphylla'
- 'Platanaceae belongs to Rosales'
- 'Platanus nobilis belongs to Platanus' according to Newberry 1868
- 'Platycarya belongs to Juglandaceae'
- 'Platycarya americana belongs to Platycarya'
- 'Polypodiaceae belongs to Filicales'
- 'Populus anomala is recombined as Dicotylophyllum anomalum'
- 'Populus genetrix is recombined as Cercidiphyllum genetrix'
- 'Porosia belongs to Araceae'
- 'Principes belongs to Monocotyledoneae'
- 'Protophyllum belongs to Platanaceae'
- 'Protophyllum semotum belongs to Protophyllum'
- 'Pterocarya belongs to Juglandaceae'
- 'Pterocarya hispida belongs to Pterocarya' according to Brown 1962
- 'Pteropsida belongs to Tracheophyta'
- 'Pterospermites cordatus is recombined as Penosphyllum cordatum'
- 'Ranales belongs to Dicotyledoneae'
- 'Rhamnales belongs to Dicotyledoneae'
- 'Rosales belongs to Dicotyledoneae'
- 'Rubiales belongs to Dicotyledoneae'
- 'Sabiaceae belongs to Sapindales'
- 'Salicaceae belongs to Salicales'
- 'Salicales belongs to Dicotyledoneae'
- 'Salix heartensis belongs to Salix'
- 'Salvinia belongs to Salviniaceae'
- 'Salvinia preauriculata belongs to Salvinia' according to Berry 1925
- 'Salviniaceae belongs to Filicales'
- 'Sapindales belongs to Dicotyledoneae'
- 'Sapindus affinis is recombined as Averrhoites affinis'
- 'Schizaeaceae belongs to Filicales'
- 'Scitamineae belongs to Monocotyledoneae'
- 'Sparganiaceae belongs to Pandanales'
- 'Sparganium belongs to Sparganiaceae'
- 'Sparganium parvum belongs to Sparganium'
- 'Sparganium stygium belongs to Sparganium' according to Heer 1855
- 'Spathiflorae belongs to Monocotyledoneae'
- 'Sphenopsida belongs to Tracheophyta'
- 'Sterculiaceae belongs to Malvales'
- 'Stillingia belongs to Euphorbiaceae'
- 'Stillingia casca belongs to Stillingia'
- 'Taxodiaceae belongs to Coniferales'
- 'Ternstroemites belongs to Theaceae'
- 'Ternstroemites aureavallis belongs to Ternstroemites'
- 'Theaceae belongs to Parietales'
- 'Thuites belongs to Cupressaceae'
- 'Thuites interruptus belongs to Thuites' according to Bell 1949
- 'Trapa belongs to Trapaceae'
- 'Trapa angulata belongs to Trapa' according to Brown 1962
- 'Trapaceae belongs to Myrtiflorae'
- 'Trochodendroides serrulata belongs to Trochodendroides' according to Wolfe 1966
- 'Ulmaceae belongs to Urticales'
- 'Umbelliflorae belongs to Dicotyledoneae'
- 'Urticales belongs to Dicotyledoneae'
- 'Viburnum belongs to Caprifoliaceae'
- 'Vitaceae belongs to Rhamnales'
- 'Wardiaphyllum daturaefolium belongs to Wardiaphyllum'
- 'Woodwardia belongs to Polypodiaceae'
- 'Woodwardia gravida belongs to Woodwardia'
- 'Zingiberaceae belongs to Scitamineae'
- 'Zingiberopsis belongs to Zingiberaceae'
- 'Zingiberopsis isonervosa belongs to Zingiberopsis'