Agoseris aurantiaca (Hook.) Kuntze accepted as Agoseris aurantiaca (Hook.) Greene (original description)
Ambrosia acanthicarpa Hook. (original description)
Antennaria carpatica (Wahlenb.) Hook. accepted as Antennaria carpatica (Wahlenb.) Bluff & Fingerh. (original description)
Antennaria carpatica var. humilis Hook. accepted as Antennaria pulcherrima subsp. eucosma (Fernald & Wiegand) R.J.Bayer (original description)
Antennaria carpatica var. pulcherrima Hook. accepted as Antennaria pulcherrima (Hook.) Greene (original description)
Antennaria plantaginifolia (L.) Hook. accepted as Antennaria plantaginifolia (L.) Richardson (original description)
Antennaria racemosa Hook. (original description)
Arnica cordifolia Hook. (original description)
Arnica menziesii Hook. accepted as Arnica latifolia Bong. (original description)
Arnica mollis Hook. (original description)
Arnica montana Hook. (original description)
Arnica montana var. angustifolia (Vahl) Hook. accepted as Arnica angustifolia subsp. angustifolia Vahl (original description)
Artemisia arctica Besser accepted as Artemisia borealis subsp. richardsoniana (Besser) Korobkov (original description)
Artemisia arctica Besser ex Hook. (original description)
Artemisia borealis var. wormskioldii Besser accepted as Artemisia campestris subsp. borealis var. borealis (Pall.) M.Peck (original description)
Artemisia caespitosa Besser accepted as Artemisia borealis subsp. richardsoniana (Besser) Korobkov (original description)
Artemisia chamissoniana Besser ex Hook. (original description)
Artemisia chamissoniana var. saxatilis Besser ex Hook. (original description)
Artemisia desertorum var. douglasiana Besser accepted as Artemisia douglasiana Besser ex Besser (original description)
Artemisia desertorum var. hookeriana Besser accepted as Artemisia campestris subsp. borealis var. borealis (Pall.) M.Peck (original description)
Artemisia desertorum var. richardsoniana (Besser) Besser accepted as Artemisia borealis subsp. richardsoniana (Besser) Korobkov (original description)
Artemisia desertorum var. scouleriana Besser accepted as Artemisia campestris var. pacifica (Nutt.) M.Peck (original description)
Artemisia dracunculus var. glauca (Pall. ex Willd.) Besser accepted as Artemisia dracunculus L. (original description)
Artemisia frigida var. gmeliniana (Besser) Besser accepted as Artemisia frigida Willd. (original description)
Artemisia michauxiana Besser (original description)
Artemisia sect. Seriphidium Besser (original description)
Balsamorhiza Hook. accepted as Wyethia Nutt. (original description)
Blepharipappus Hook. (original description)
Blepharipappus glandulosus Hook. accepted as Layia glandulosa (Hook.) Hook. & Arn. (original description)
Blepharipappus scaber Hook. (original description)
Calliopsis atkinsoniana (Douglas ex Lindl.) Hook. accepted as Coreopsis tinctoria Nutt. (original description)
Carduus discolor Hook. accepted as Cirsium canescens Nutt. (original description)
Carduus foliosus Hook. accepted as Cirsium foliosum (Hook.) DC. (original description)
Carduus pumilus Hook. accepted as Cirsium drummondii Torr. & A.Gray (original description)
Carduus remotifolius Hook. accepted as Cirsium remotifolium (Hook.) DC. (original description)
Chrysanthemum nanum Hook. accepted as Blennosperma nanum (Hook.) S.F.Blake (original description)
Crepis biennis Hook. (original description)
Crepis elegans Hook. accepted as Askellia elegans (Hook.) W.A.Weber (original description)
Crocidium Hook. (original description)
Crocidium multicaule Hook. (original description)
Eupatorium occidentale Hook. accepted as Ageratina occidentalis (Hook.) R.M.King & H.Rob. (original description)
Helianthus longifolius Hook. (original description)
Helianthus multiflorus Hook. accepted as Helianthus annuus L. (original description)
Heliopsis balsamorhiza Hook. accepted as Balsamorhiza hookeri (Hook.) Nutt. (original description)
Heliopsis terebinthacea Hook. (original description)
Hieracium albiflorum Hook. (original description)
Hieracium gracile Hook. accepted as Hieracium triste Willd. ex Spreng. (original description)
Hieracium longipilum Torr. ex Hook. (original description)
Hieracium prenanthoides Hook. (original description)
Hieracium scouleri Hook. (original description)
Hieracium venosum var. gracile Hook. (original description)
Hymenonema glauca Hook. accepted as Microseris laciniata (Hook.) Sch.Bip. (original description)
Hymenonema laciniata Hook. accepted as Microseris laciniata (Hook.) Sch.Bip. (original description)
Hymenopappus douglasii Hook. accepted as Chaenactis douglasii (Hook.) Hook. & Arn. (original description)
Hymenopappus filifolius Hook. (original description)
Hymenopappus scabiosaeus Douglas ex Hook. (original description)
Hymenopappus tenuifolius Douglas ex Hook. (original description)
Leontodon hirsutus Hook. accepted as Agoseris hirsuta (Hook.) Greene (original description)
Liatris punctata Hook. (original description)
Lygodesmia minor Hook. accepted as Stephanomeria tenuifolia (Raf.) H.M.Hall (original description)
Nabalus alatus Hook. (original description)
Nabalus cordatus (Willd.) Hook. accepted as Nabalus altissimus (L.) Hook. (original description)
Nardosmia corymbosa (R.Br.) Hook. (original description)
Nardosmia frigida (L.) Hook. accepted as Petasites frigidus (L.) Fr. (original description)
Nardosmia palmata (Aiton) Hook. accepted as Petasites frigidus var. palmatus (Aiton) Cronquist (original description)
Nardosmia sagittata (Banks ex Pursh) Hook. accepted as Petasites frigidus var. sagittatus (Banks ex Pursh) (original description)
Picradenia Hook. accepted as Helenium L. (original description)
Picradenia richardsonii Hook. accepted as Hymenoxys richardsonii var. richardsonii (Hook.) Cockerell (original description)
Pyrethrum inodorum var. nanum Hook. (original description)
Pyrrocoma Hook. (original description)
Pyrrocoma carthamoides Hook. (original description)
Senecio atriplicifolius (L.) Hook. accepted as Arnoglossum atriplicifolium (L.) H.Rob. (original description)
Senecio atriplicifolius var. reniformis Hook. accepted as Arnoglossum reniforme (Hook.) H.Rob. (original description)
Senecio aureus var. discoideus Hook. accepted as Packera pauciflora (Pursh) Á.Löve & D.Löve (original description)
Senecio aureus var. foliosus Hook. (original description)
Senecio aureus var. gracilis (Pursh) Hook. accepted as Packera aurea (L.) Á.Löve & D.Löve (original description)
Senecio canus Hook. accepted as Packera cana (Hook.) W.A.Weber & Á.Löve (original description)
Senecio integrifolius Hook. (original description)
Senecio palustris (L.) Hook. accepted as Tephroseris palustris (L.) Rchb. (original description)
Senecio palustris var. congestus (R.Br. ex Parry) Hook. (original description)
Senecio serra Hook. (original description)
Senecio triangularis Hook. (original description)
Tanacetum suaveolens (Pursh) Hook. accepted as Matricaria discoidea DC. (original description)
Trichophyllum integrifolium Hook. accepted as Eriophyllum lanatum var. integrifolium (Hook.) Smiley (original description)