Acourtia formosa Hook. & Arn. accepted as Acourtia fruticosa (La Llave & Lex.) B.L.Turner (original description)
Allocarpus scabrifolius Hook. & Arn. accepted as Alloispermum scabrifolium (Hook. & Arn.) H.Rob. (original description)
Anisopappus Hook. & Arn. (original description)
Anisopappus chinensis (L.) Hook. & Arn. (original description)
Artemisia glomerata Hook. & Arn. accepted as Artemisia senjavinensis Besser (original description)
Artemisia inodora Hook. & Arn. accepted as Artemisia dracunculus L. (original description)
Aster filaginifolius Hook. & Arn. accepted as Corethrogyne filaginifolia (Hook. & Arn.) Nutt. (original description)
Aster spectabilis Hook. & Arn. (original description)
Aster tomentellus Hook. & Arn. accepted as Corethrogyne filaginifolia (Hook. & Arn.) Nutt. (original description)
Baccharis absinthioides Hook. & Arn. accepted as Tessaria absinthioides (Hook. & Arn.) DC. (original description)
Baccharis glutinosa (Spreng.) Hook. & Arn. accepted as Gymnosperma glutinosum (Spreng.) Less. (original description)
Baccharis mucronata Hook. & Arn. accepted as Haplopappus mucronatus (Hook. & Arn.) Hook. & Arn. ex B.D.Jacks. (original description)
Baccharis obovata Hook. & Arn. (original description)
Baccharis resinosa Hook. & Arn. accepted as Baccharis vernalis F.H.Hellw. (original description)
Baccharis rigida Hook. & Arn. accepted as Baccharis racemosa (Ruiz & Pav.) DC. (original description)
Baccharis rosmarinifolia Hook. & Arn. accepted as Baccharis linearis (Ruiz & Pav.) Pers. (original description)
Baccharis viscosa Hook. & Arn. accepted as Baccharis glutinosa Pers. (original description)
Bahia gracilis Hook. & Arn. accepted as Eriophyllum lanatum var. integrifolium (Hook.) Smiley (original description)
Barkhausia lessingii Hook. & Arn. accepted as Agoseris apargioides (Less.) Greene (original description)
Barnadesia ulicina Hook. & Arn. (original description)
Bidens bipinnata Hook. & Arn. (original description)
Bidens paniculata Hook. & Arn. accepted as Bidens australis Spreng. (original description)
Blumea chinensis Hook. & Arn. accepted as Inula cappa (Buch.-Ham. ex D.Don) DC. (original description)
Bulbostylis rigida Hook. & Arn. accepted as Brickellia lanata (DC.) A.Gray (original description)
Cacalia cirsiifolia Hook. & Arn. accepted as Senecio cirsiifolius (Hook. & Arn.) Sch.Bip. (original description)
Cacalia denticulata Hook. & Arn. (original description)
Cacalia sessilifolia Hook. & Arn. accepted as Senecio sessilifolius (Hook. & Arn.) Hemsl. (original description)
Calliglossa Hook. & Arn. accepted as Layia Hook. & Arn. ex DC. (original description)
Calliglossa douglasii Hook. & Arn. accepted as Layia chrysanthemoides (DC.) A.Gray (original description)
Chaenactis achilleifolia Hook. & Arn. accepted as Chaenactis douglasii (Hook.) Hook. & Arn. (original description)
Chaenactis douglasii (Hook.) Hook. & Arn. (original description)
Chaenactis stevioides Hook. & Arn. (original description)
Chaetanthera chilensis Hook. & Arn. accepted as Chaetanthera incana Poepp. ex Less. (original description)
Chlamysperma arenarioides Hook. & Arn. accepted as Galeana pratensis (Kunth) Rydb. (original description)
Chrysopsis scabra Hook. & Arn. accepted as Oxypappus scaber Benth. (original description)
Cineraria integrifolia Hook. & Arn. accepted as Senecio lugens Richardson (original description)
Coelestina petiolata Hook. & Arn. accepted as Ageratum petiolatum (Hook. & Arn.) Hemsl. (original description)
Diplopappus occidentalis Hook. & Arn. accepted as Erigeron foliosus Nutt. (original description)
Distasis concinna (ex Hooker & Arn.) Hook. & Arn. accepted as Erigeron concinnus var. concinnus (Hook. & Arn.) Torr. & A.Gray (original description)
Dubautia laxa Hook. & Arn. (original description)
Erigeron multiflorus Hook. & Arn. accepted as Symphyotrichum subulatum var. parviflorum (Nees) S.D.Sundb. (original description)
Erigeron pauciflorus Hook. & Arn. accepted as Vittadinia chamissonis A.Gray (original description)
Erigeron spiculosus Hook. & Arn. accepted as Conyza spiculosa (Hook. & Arn.) Zardini (original description)
Erigeron velutipes Hook. & Arn. (original description)
Eupatorium lasioneuron Hook. & Arn. accepted as Ageratina lasioneura (Hook. & Arn.) R.M.King & H.Rob. (original description)
Eupatorium nigrescens Hook. & Arn. accepted as Chromolaena collina (DC.) R.M.King & H.Rob. (original description)
Eupatorium ovaliflorum Hook. & Arn. accepted as Chromolaena glaberrima (DC.) R.M.King & H.Rob. (original description)
Eupatorium reticulatum Hook. & Arn. accepted as Aristeguietia salvia (Colla) R.M.King & H.Rob. (original description)
Galinsoga resinosa Hook. & Arn. accepted as Gutierrezia resinosa (Hook. & Arn.) S.F.Blake (original description)
Gnaphalium chilense Hook. & Arn. accepted as Helichrysum chilense Phil. (original description)
Gnaphalium citrinum Hook. & Arn. accepted as Gnaphalium cheiranthifolium Lam. (original description)
Gnaphalium filaginoides Hook. & Arn. accepted as Logfia filaginoides (Hook. & Arn.) Morefield (original description)
Gnaphalium sprengelii Hook. & Arn. accepted as Gnaphalium montevidense Spreng. (original description)
Gnaphalium ulophyllum Hook. & Arn. accepted as Gnaphalium cymatoides Kunze ex DC. (original description)
Grindelia hirsutula Hook. & Arn. (original description)
Grindelia humilis Hook. & Arn. accepted as Grindelia hirsutula Hook. & Arn. (original description)
Gymnocoronis latifolia Hook. & Arn. (original description)
Gynura bulbosa (Lour.) Hook. & Arn. accepted as Gynura pseudochina (L.) DC. (original description)
Haplopappus ericoides (Less.) Hook. & Arn. accepted as Ericameria ericoides (Less.) Nutt. ex Jeps. (original description)
Haplopappus florifer (Hook.) Hook. & Arn. accepted as Townsendia florifer (Hook.) A.Gray (original description)
Haplopappus mucronatus Hook. & Arn. (original description)
Haplopappus squarrosus Hook. & Arn. accepted as Hazardia squarrosa (Hook. & Arn.) Greene (original description)
Hartmannia pungens Hook. & Arn. accepted as Centromadia pungens (Hook. & Arn.) Greene (original description)
Hebeclinium tepicanum Hook. & Arn. accepted as Critonia hebebotrya DC. (original description)
Helenium pubescens Hook. & Arn. (original description)
Helianthus glutinosus Hook. & Arn. accepted as Flourensia thurifera (Molina) DC. accepted as Austroflourensia thurifera (Molina) J.C.Ospina & S.E.Freire (original description)
Hemizonia filipes Hook. & Arn. accepted as Holozonia filipes (Hook. & Arn.) Greene (original description)
Hemizonia multicaulis Hook. & Arn. accepted as Hemizonia congesta subsp. lutescens (Greene) Babc. & H.M.Hall (original description)
Hemizonia sericea Hook. & Arn. accepted as Hemizonia congesta subsp. luzulifolia (DC.) Babc. & H.M.Hall (original description)
Hisutsua serrata Hook. & Arn. accepted as Aster indicus L. (original description)
Hypochaeris apargioides Hook. & Arn. (original description)
Jaegeria pedunculata Hook. & Arn. (original description)
Layia douglasii Hook. & Arn. accepted as Layia glandulosa (Hook.) Hook. & Arn. (original description)
Layia glandulosa (Hook.) Hook. & Arn. (original description)
Layia heterotricha (DC.) Hook. & Arn. (original description)
Layia hieracioides (DC.) Hook. & Arn. (original description)
Leucheria senecioides Hook. & Arn. (original description)
Lipochaeta macrocephala Hook. & Arn. accepted as Lasianthaea macrocephala (Hook. & Arn.) K.M.Becker (original description)
Lipochaeta umbellata Hook. & Arn. (original description)
Microrhynchus lessingii Hook. & Arn. (original description)
Pectis diffusa Hook. & Arn. (original description)
Pectis taliscana Hook. & Arn. accepted as Pectis uniaristata var. uniaristata DC. (original description)
Phania dissecta Hook. & Arn. accepted as Hofmeisteria dissecta (Hook. & Arn.) R.M.King & H.Rob. (original description)
Phania urenifolia Hook. & Arn. accepted as Hofmeisteria urenifolia (Hook. & Arn.) Walp. (original description)
Proustia ilicifolia Hook. & Arn. (original description)
Pyrrocoma menziesii Hook. & Arn. accepted as Isocoma menziesii (Hook. & Arn.) G.L.Nesom (original description)
Senecio arnicoides Hook. & Arn. (original description)
Senecio bipinnatifidus Hook. & Arn. (original description)
Senecio bridgesii Hook. & Arn. (original description)
Senecio denticulatus Hook. & Arn. (original description)
Senecio glabratus Hook. & Arn. (original description)
Senecio kalmii Hook. & Arn. (original description)
Senecio nigrescens Hook. & Arn. (original description)
Sinclairia Hook. & Arn. (original description)
Sinclairia discolor Hook. & Arn. (original description)
Solidago petiolaris Hook. & Arn. (original description)
Sonchus californicus (DC.) Hook. & Arn. accepted as Malacothrix saxatilis (Nutt.) Torr. & A.Gray (original description)
Spilanthes pseudoacmella Hook. & Arn. (original description)
Stevia elliptica Hook. & Arn. accepted as Stevia caracasana DC. (original description)
Stevia glandulosa Hook. & Arn. (original description)