Actinella glabra Nutt. (original description)
Actinella lanata Nutt. accepted as Tetraneuris acaulis var. caespitosa A.Nelson (original description)
Actinella richardsonii (Hook.) Nutt. accepted as Hymenoxys richardsonii (Hook.) Cockerell (original description)
Actinella scaposa (DC.) Nutt. accepted as Hymenoxys scaposa (DC.) K.F.Parker accepted as Tetraneuris scaposa (DC.) Greene (original description)
Actinella torreyana Nutt. accepted as Tetraneuris torreyana (Nutt.) Greene (original description)
Actinomeris nudicaulis Nutt. (original description)
Adenocaulon integrifolium Nutt. accepted as Adenocaulon bicolor Hook. (original description)
Ambrosia longistylis Nutt. (original description)
Amida Nutt. accepted as Madia Molina (original description)
Amida gracilis Nutt. accepted as Madia glomerata Hook. (original description)
Amida hirsuta Nutt. accepted as Madia glomerata Hook. (original description)
Ammodia Nutt. accepted as Heterotheca Cass. (original description)
Ammodia oregana Nutt. (original description)
Ammodia oregona Nutt. accepted as Chrysopsis oregona (Nutt.) A.Gray (original description)
Amphiachyris (DC.) Nutt. (original description)
Amphiachyris dracunculoides (DC.) Nutt. accepted as Gutierrezia dracunculoides (DC.) O.Hoffm. (original description)
Anisocarpus Nutt. (original description)
Anisocarpus madioides Nutt. (original description)
Antennaria labradorica Nutt. (original description)
Antennaria parvifolia Nutt. (original description)
Apogon humilis Nutt. (original description)
Arnica amplexicaulis Nutt. accepted as Arnica lanceolata subsp. prima (Maguire) Strother & S.J.Wolf (original description)
Arnica foliosa Nutt. accepted as Arnica chamissonis Less. (original description)
Arnica foliosa var. andina Nutt. accepted as Arnica chamissonis Less. (original description)
Arnica lanceolata Nutt. (original description)
Arnica macrophylla Nutt. accepted as Arnica cordifolia Hook. (original description)
Aromia Nutt. accepted as Amblyopappus Hook. & Arn. (original description)
Aromia tenuifolia Nutt. accepted as Amblyopappus pusillus Hook. & Arn. (original description)
Artemisia abrotanoides Nutt. accepted as Artemisia californica Less. (original description)
Artemisia arbuscula Nutt. (original description)
Artemisia foliosa Nutt. accepted as Artemisia californica Less. (original description)
Artemisia heterophylla Nutt. accepted as Artemisia suksdorfii Piper (original description)
Artemisia incompta Nutt. accepted as Artemisia ludoviciana subsp. incompta (Nutt.) D.D.Keck (original description)
Artemisia pacifica Nutt. accepted as Artemisia campestris var. pacifica (Nutt.) M.Peck (original description)
Artemisia pedatifida Nutt. (original description)
Artemisia plattensis Nutt. accepted as Artemisia filifolia Torr. (original description)
Artemisia pumila Nutt. accepted as Artemisia ludoviciana subsp. incompta (Nutt.) D.D.Keck (original description)
Artemisia tridentata Nutt. (original description)
Artemisia trifida Nutt. accepted as Artemisia tripartita subsp. tripartita Rydb. (original description)
Aster amethystina Nutt. (original description)
Aster amethystinus Nutt. accepted as Symphyotrichum ×amethystinum (Nutt.) G.L.Nesom (original description)
Aster andinus Nutt. (original description)
Aster asperrimus Nutt. accepted as Symphyotrichum grandiflorum (L.) G.L.Nesom (original description)
Aster bracteolatus Nutt. accepted as Symphyotrichum eatonii (A.Gray) G.L.Nesom (original description)
Aster campestris Nutt. accepted as Symphyotrichum campestre (Nutt.) G.L.Nesom (original description)
Aster ciliatus Nutt. accepted as Symphyotrichum pratense (Raf.) G.L.Nesom (original description)
Aster denudatus Nutt. accepted as Symphyotrichum ascendens (Lindl.) G.L.Nesom (original description)
Aster denudatus var. ciliatifolius Nutt. accepted as Symphyotrichum ascendens (Lindl.) G.L.Nesom (original description)
Aster glacialis Nutt. accepted as Erigeron glacialis (Nutt.) A.Nelson (original description)
Aster integrifolius Nutt. accepted as Eurybia integrifolia (Nutt.) G.L.Nesom (original description)
Aster ramulosus Nutt. accepted as Symphyotrichum ascendens (Lindl.) G.L.Nesom (original description)
Aster sayianus Nutt. accepted as Canadanthus modestus (Lindl.) G.L.Nesom (original description)
Astranthium Nutt. (original description)
Astranthium integrifolium (Michx.) Nutt. (original description)
Baccharis pingraea Nutt. accepted as Gymnosperma glutinosum (Spreng.) Less. (original description)
Baccharis salicifolia Nutt. accepted as Baccharis salicina Torr. & A.Gray (original description)
Bahia multiflora (Nutt.) Nutt. accepted as Eriophyllum lanatum var. integrifolium (Hook.) Smiley (original description)
Bahia trifida Nutt. accepted as Eriophyllum confertiflorum var. trifidum (Nutt.) A.Gray (original description)
Balsamorhiza deltoidea Nutt. (original description)
Balsamorhiza helianthoides (Nutt.) Nutt. accepted as Balsamorhiza sagittata (Pursh) Nutt. (original description)
Balsamorhiza hirsuta Nutt. accepted as Balsamorhiza hookeri (Hook.) Nutt. (original description)
Balsamorhiza hookeri (Hook.) Nutt. (original description)
Balsamorhiza incana Nutt. (original description)
Balsamorhiza macrophylla Nutt. (original description)
Balsamorhiza sagittata (Pursh) Nutt. (original description)
Balsamorhiza terebinthacea (Hook.) Nutt. (original description)
Barkhausia elegans (Hook.) Nutt. accepted as Askellia elegans (Hook.) W.A.Weber (original description)
Berlandiera longifolia Nutt. accepted as Berlandiera texana DC. (original description)
Berlandiera pumila (Michx.) Nutt. (original description)
Berlandiera subacaulis (Nutt.) Nutt. (original description)
Berlandiera tomentosa (Pursh) Nutt. accepted as Berlandiera pumila (Michx.) Nutt. (original description)
Bidens angustifolia Nutt. accepted as Bidens sandvicensis Less. (original description)
Bidens hirsuta Nutt. accepted as Bidens pilosa L. (original description)
Bidens mutica Nutt. accepted as Bidens sandvicensis Less. (original description)
Bidens quadriaristata var. dentata Nutt. accepted as Bidens cernua L. (original description)
Bolophyta Nutt. accepted as Parthenium L. (original description)
Bolophyta alpina Nutt. accepted as Parthenium alpinum (Nutt.) Torr. & A.Gray (original description)
Brachyris divaricata Nutt. accepted as Gutierrezia sarothrae (Pursh) Britton & Rusby (original description)
Brickellia grandiflora (Hook.) Nutt. (original description)
Brickellia oblongifolia Nutt. (original description)
Bulbostylis microphylla Nutt. accepted as Brickellia microphylla (Nutt.) A.Gray (original description)
Burrielia hirsuta Nutt. accepted as Lasthenia gracilis (DC.) Greene (original description)
Burrielia longifolia Nutt. accepted as Lasthenia gracilis (DC.) Greene (original description)
Burrielia parviflora Nutt. accepted as Lasthenia gracilis (DC.) Greene (original description)
Burrielia sect. Amphiachaenia Nutt. accepted as Lasthenia sect. Amphiachaenia (Nutt.) R.Chan (original description)
Calodonta Nutt. accepted as Tolpis Adans. (original description)
Calodonta azorica Nutt. accepted as Tolpis azorica (Nutt.) P.Silva (original description)
Carduus occidentalis Nutt. (original description)
Chaenactis tenuifolia Nutt. accepted as Chaenactis glabriuscula var. glabriuscula DC. (original description)
Chrysoma pumila Nutt. accepted as Petradoria pumila (Nutt.) Greene (original description)
Chrysoma uniligulata (DC.) Nutt. accepted as Solidago uliginosa Nutt. (original description)
Chrysopsis foliosa Nutt. accepted as Heterotheca villosa var. foliosa (Nutt.) V.L.Harms (original description)
Chrysopsis lamarckii (Cass.) Nutt. accepted as Xanthisma spinulosum (Pursh) D.R.Morgan & R.L.Hartm. (original description)
Chrysopsis mollis Nutt. accepted as Heterotheca villosa var. villosa (Pursh) Shinners (original description)
Chrysopsis sessiliflora Nutt. accepted as Heterotheca sessiliflora (Nutt.) Shinners (original description)
Chrysothamnus Nutt. (original description)
Chrysothamnus dracunculoides (DC.) Nutt. accepted as Ericameria nauseosa var. graveolens (Nutt.) Reveal & Schuyler (original description)
Chrysothamnus lanceolatus Nutt. accepted as Chrysothamnus viscidiflorus subsp. lanceolatus (Nutt.) H.M.Hall & Clem. (original description)
Chrysothamnus pumilus Nutt. accepted as Chrysothamnus viscidiflorus (Hook.) Nutt. (original description)
Chrysothamnus speciosus Nutt. accepted as Ericameria nauseosa var. speciosa (Nutt.) G.L.Nesom & G.I.Baird (original description)