Opinions from F. H. Knowlton 1926
- 'Abietineae was reranked as a subfamily and belongs to Taxaceae'
- 'Acer belongs to Staphyleaceae'
- 'Acer bendirei belongs to Acer'
- 'Acer chaneyi belongs to Acer'
- 'Acer merriami belongs to Acer'
- 'Acer minor belongs to Acer'
- 'Alnus belongs to Betulaceae'
- 'Anacardiaceae belongs to Sapindales'
- 'Araceae belongs to Arales'
- 'Arales belongs to Monocotyledones'
- 'Archaeomnium belongs to Mniaceae'
- 'Arisaema belongs to Araceae'
- 'Arisaema hesperia belongs to Arisaema'
- 'Betula belongs to Betulaceae'
- 'Betula bryani belongs to Betula'
- 'Betula fairii belongs to Betula'
- 'Betula heteromorpha belongs to Betula' according to Knowlton 1902
- 'Betula heteromorpha belongs to Betula'
- 'Betula largei belongs to Betula'
- 'Betula nanoides belongs to Betula'
- 'Betula thor belongs to Betula'
- 'Betulaceae belongs to Fagales'
- 'Caesalpiniaceae belongs to Rosales'
- 'Carpinus belongs to Betulaceae'
- 'Carpites boraginoides belongs to Carpites'
- 'Carpites ginkgoides belongs to Carpites'
- 'Carpites magnifica belongs to Carpites'
- 'Carpites menthoides belongs to Carpites'
- 'Carpites paulownia belongs to Carpites'
- 'Carpites polygonoides belongs to Carpites'
- 'Carpites spokanensis belongs to Carpites'
- 'Castanea belongs to Betulaceae'
- 'Celastraceae belongs to Sapindales'
- 'Celastrus belongs to Celastraceae'
- 'Celastrus fernquisti belongs to Celastrus'
- 'Cercis belongs to Caesalpiniaceae'
- 'Cercis spokanensis belongs to Cercis'
- 'Coniferales belongs to Gymnospermae'
- 'Cupressineae was reranked as a subfamily and belongs to Taxaceae'
- 'Cymbella partita belongs to Cymbella' according to Mann 1926
- 'Cymbella sagittarius belongs to Cymbella' according to Mann 1926
- 'Dicotyledones was reranked as a subclass and belongs to Angiospermae'
- 'Diospyros belongs to Ebenaceae'
- 'Diospyros andersonae belongs to Diospyros'
- 'Diospyros microcalyx belongs to Diospyros'
- 'Drupaceae belongs to Rosales'
- 'Ebenaceae belongs to Ebenales'
- 'Ebenales belongs to Dicotyledones'
- 'Equisetaceae belongs to Equisetales'
- 'Equisetum belongs to Equisetaceae'
- 'Ericales is corrected as Ericales and belongs to Dicotyledones'
- 'Fagales belongs to Dicotyledones'
- 'Fagus castaneaefolia is recombined as Castanea castaneaefolia'
- 'Ficus belongs to Moraceae'
- 'Ficus washingtonensis belongs to Ficus'
- 'Ginkgo belongs to Ginkgoaceae'
- 'Ginkgoaceae belongs to Ginkgoales'
- 'Ginkgoales belongs to Gymnospermae'
- 'Graminales belongs to Monocotyledones'
- 'Hamamelidaceae belongs to Rosales'
- 'Hydrangea belongs to Saxifragaceae'
- 'Lauraceae belongs to Thymeleales'
- 'Laurus belongs to Lauraceae'
- 'Laurus californica belongs to Laurus'
- 'Laurus grandis belongs to Laurus'
- 'Laurus princeps belongs to Laurus'
- 'Laurus similis belongs to Laurus' according to Knowlton 1900
- 'Laurus similis belongs to Laurus'
- 'Libocedrus belongs to Cupressineae'
- 'Libocedrus praedecurrens belongs to Libocedrus'
- 'Liquidambar belongs to Hamamelidaceae'
- 'Liquidambar pachyphyllum belongs to Liquidambar'
- 'Lycopodiaceae belongs to Lycopodiales'
- 'Lycopodium belongs to Lycopodiaceae'
- 'Lycopodium hesperium belongs to Lycopodium'
- 'Magnolia belongs to Magnoliaceae'
- 'Magnolia dayana belongs to Magnolia'
- 'Magnoliaceae belongs to Ranales'
- 'Malva belongs to Malvaceae'
- 'Malva hesperia belongs to Malva'
- 'Malvaceae belongs to Malvales'
- 'Malvales belongs to Dicotyledones'
- 'Marsilea bendirei is recombined as Hydrangea bendirei'
- 'Meibomites belongs to Papilionaceae'
- 'Meibomites lucens belongs to Meibomites'
- 'Mniaceae belongs to Musci'
- 'Monocotyledones was reranked as a subclass and belongs to Angiospermae'
- 'Moraceae belongs to Urticales'
- 'Musci belongs to Bryophyta'
- 'Najadales [misspelled as Naiadales] belongs to Monocotyledones'
- 'Navicula contendens belongs to Navicula' according to Mann 1926
- 'Navicula iridescens belongs to Navicula' according to Mann 1926
- 'Navicula pauper belongs to Navicula' according to Mann 1926
- 'Navicula pontifica belongs to Navicula' according to Mann 1926
- 'Navicula protrudens belongs to Navicula' according to Mann 1926
- 'Navicula pseudoaffinis belongs to Navicula' according to Mann 1926
- 'Navicula reversa belongs to Navicula' according to Mann 1926
- 'Navicula substauroneis belongs to Navicula' according to Mann 1926
- 'Pandanales belongs to Monocotyledones'
- 'Papilionaceae belongs to Rosales'
- 'Phyllites amplexicaulis belongs to Phyllites'
- 'Phyllites crustacea belongs to Phyllites'
- 'Phyllites dubius is recombined as Taxodium dubium'
- 'Phyllites pardeei belongs to Phyllites'
- 'Phyllites peculiaris belongs to Phyllites'
- 'Phyllites relatus belongs to Phyllites'
- 'Phyllites sophoroides belongs to Phyllites'
- 'Pinus belongs to Abietineae'
- 'Polytrichaceae belongs to Musci'
- 'Polytrichites belongs to Polytrichaceae'
- 'Populus belongs to Salicaceae'
- 'Populus fairii belongs to Populus'
- 'Populus heteromorpha belongs to Populus'
- 'Populus lindgreni belongs to Populus'
- 'Populus washingtonensis belongs to Populus'
- 'Potamogeton belongs to Potamogetonaceae'
- 'Potamogetonaceae belongs to Najadales'
- 'Prunus belongs to Drupaceae'
- 'Prunus rustii belongs to Prunus'
- 'Quercus chaneyi belongs to Quercus'
- 'Quercus cognatus belongs to Quercus'
- 'Quercus merriami belongs to Quercus'
- 'Quercus obtusa belongs to Quercus'
- 'Quercus payettensis belongs to Quercus'
- 'Quercus praenigra belongs to Quercus'
- 'Quercus pseudolyrata belongs to Quercus'
- 'Quercus rustii belongs to Quercus'
- 'Quercus simulata belongs to Quercus'
- 'Quercus spokanensis belongs to Quercus'
- 'Ranales belongs to Dicotyledones'
- 'Rhus belongs to Anacardiaceae'
- 'Rhus typhinoides belongs to Rhus'
- 'Robinia belongs to Papilionaceae'
- 'Rosales belongs to Dicotyledones'
- 'Salicaceae belongs to Salicales'
- 'Salicales belongs to Dicotyledones'
- 'Salisburia adiantoides is recombined as Ginkgo adiantoides'
- 'Salix belongs to Salicaceae'
- 'Salix bryani belongs to Salix'
- 'Salix dayana belongs to Salix'
- 'Salix elongata belongs to Salix'
- 'Salix inquirenda belongs to Salix'
- 'Salix perplexa belongs to Salix'
- 'Salix remotidens belongs to Salix'
- 'Sapindales belongs to Dicotyledones'
- 'Saxifragaceae belongs to Rosales'
- 'Sequoia belongs to Taxodieae'
- 'Sophora belongs to Papilionaceae'
- 'Sophora alexanderi belongs to Sophora'
- 'Sophora spokanensis belongs to Sophora'
- 'Staphyleaceae belongs to Sapindales'
- 'Stauroneis acutissima belongs to Stauroneis' according to Mann 1926
- 'Taxaceae belongs to Coniferales'
- 'Taxeae belongs to Taxaceae'
- 'Taxites langsdorfii is recombined as Sequoia langsdorfii'
- 'Taxodieae belongs to Taxaceae'
- 'Taxodium belongs to Taxodieae'
- 'Thymeleales belongs to Dicotyledones'
- 'Tumion belongs to Taxeae'
- 'Tumion bonseri belongs to Tumion'
- 'Typha belongs to Typhaceae'
- 'Typhaceae belongs to Pandanales'
- 'Ulmaceae belongs to Urticales'
- 'Ulmus belongs to Ulmaceae'
- 'Ulmus fernquisti belongs to Ulmus'
- 'Ulmus speciosa belongs to Ulmus'
- 'Urticales belongs to Dicotyledones'
- 'Vacciniaceae belongs to Ericales'
- 'Vaccinium belongs to Vacciniaceae'
- 'Vaccinium salicoides belongs to Vaccinium'