×Carduogalactites ludoviciae (Bertr.) P.Fourn.
×Cirsio-carduus borderi (Rouy) Arènes (uncertain > unassessed )
×Cirsio-carduus cirsiformis (Vuk.) Arènes
×Cirsio-carduus hohenackeri Arènes
×Cirsio-carduus jaubertianus (Sennen & Septimin) Arènes
×Cirsio-carduus lutetianus Arènes
×Cirsio-carduus parisiensis P.Fourn.
Acarna caespitosa Willd. accepted as Atractylis cancellata L.
Acarna casabonae Hill. accepted as Ptilostemon casabonae (L.) Greuter
Acarna chinensis Bunge accepted as Atractylodes lancea (Thunb.) DC.
Acarna comosa Spreng. accepted as Carlina comosa (Spreng.) Greuter
Acarna cyanoides (uncertain > unassessed )
Acarna gummifera Willd. accepted as Carlina gummifera (L.) Less.
Acarna lancea Willd. accepted as Atractylodes ovata (Thunb.) DC.
Acarna leucographa Hill accepted as Tyrimnus leucographus (L.) Cass.
Acarna macrocephala Willd. accepted as Carlina gummifera (L.) Less.
Acarna macrophylla Willd. accepted as Carlina macrophylla (Desf.) DC.
Acarna onopyxe Hill accepted as Carduus onopyxos Hill
Acarna ovata Willd. accepted as Atractylodes ovata (Thunb.) DC.
Acarna rigida Godet ex DC. accepted as Jurinea longifolia DC.
Acarna serratuloides Spreng. accepted as Atractylis serratuloides (Cass.) DC.
Acroptilon angustifolium Cass. accepted as Rhaponticum repens (L.) Hidalgo
Acroptilon australe Iljin accepted as Rhaponticum repens (L.) Hidalgo
Acroptilon obtusifolium Cass. accepted as Rhaponticum repens (L.) Hidalgo
Acroptilon picris (Pall. ex Willd.) C.A.Mey. accepted as Rhaponticum repens (L.) Hidalgo
Acroptilon picris (Pall. ex Willd.) DC. accepted as Rhaponticum repens (L.) Hidalgo
Acroptilon repens (L.) DC. accepted as Rhaponticum repens (L.) Hidalgo
Acroptilon repens subsp. australe (Iljin) Gubanov accepted as Acroptilon repens subsp. australe (Iljin) Rech.f.
Acroptilon repens subsp. australe (Iljin) Rech.f.
Acroptilon repens subsp. repens
Acroptilon serratum Cass. accepted as Rhaponticum repens (L.) Hidalgo
Acroptilon subdentatum Cass. accepted as Rhaponticum repens (L.) Hidalgo
Afrocarduus afromontanus (R.E.Fr.) Garcia-Jacas, Moreyra & Susanna
Afrocarduus keniensis (R.E.Fr.) Garcia-Jacas, Moreyra & Susanna
Afrocarduus kikuyorum (R.E.Fr.) Garcia-Jacas, Moreyra & Susanna
Afrocarduus kikuyorum subsp. kikuyorum (R.E.Fr.) C.Jeffrey
Afrocarduus kikuyorum var. kikuyorum accepted as Afrocarduus kikuyorum (R.E.Fr.) Garcia-Jacas, Moreyra & Susanna
Afrocarduus leptacanthus (Fresen.) Garcia-Jacas, Moreyra & Susanna
Afrocarduus macracanthus (Kazmi) Garcia-Jacas, Moreyra & Susanna
Afrocarduus millefolius (R.E.Fr.) Garcia-Jacas, Moreyra & Susanna
Afrocarduus nyassanus (S.Moore) Garcia-Jacas, Moreyra & Susanna
Afrocarduus ruwenzoriensis (S.Moore) Garcia-Jacas, Moreyra & Susanna
Afrocarduus schimperi (Sch.Bip.) Garcia-Jacas, Moreyra & Susanna
Afrocarduus silvarum (R.E.Fr.) Garcia-Jacas, Moreyra & Susanna
Afrocirsium buchwaldii (O.Hoffm.) Calleja, Garcia-Jacas, Moreyra & Susanna
Afrocirsium schimperi (Vatke) Calleja, Garcia-Jacas, Moreyra & Susanna,
Afrocirsium straminispinum (C.Jeffrey) Calleja, Garcia-Jacas, Moreyra & Susanna
Arcyna tournefortii (Boiss. & Reut.) Wiklund accepted as Cynara tournefortii Boiss. & Reut.
Ascalea lanceata Hill accepted as Cirsium vulgare (Savi) Ten.
Ascalea lanceolata (L.) Hill accepted as Cirsium vulgare (Savi) Ten.
Ascalea nutans (L.) Hill accepted as Carduus nutans subsp. platypus (Lange) Greuter
Bourgaea humilis (L.) Coss. accepted as Cynara humilis L.
Bourgaea humilis var. humilis accepted as Bourgaea humilis (L.) Coss. accepted as Cynara humilis L.
Bourgaea humilis var. leucantha Coss. accepted as Cynara humilis L.
Bourgaea tournefortii (Boiss. & Reut.) Willk. accepted as Cynara tournefortii Boiss. & Reut.
Breea arvensis (L.) Less. accepted as Cirsium arvense (L.) Scop.
Breea dioica (Cass.) Less. accepted as Cirsium arvense (L.) Scop.
Breea ochrolepidia (Juz.) Soják accepted as Cirsium arvense (L.) Scop.
Breea praealta Less. accepted as Cirsium arvense (L.) Scop.
Breea segeta (Bunge) Kitam.
Breea segeta f. lactiflora (Nakai) W.Lee accepted as Breea segeta (Bunge) Kitam.
Breea segeta f. segeta accepted as Breea segeta (Bunge) Kitam.
Breea segetum (Bunge) Kitam. (uncertain > unassessed )
Breea segetum f. lactiflora (Nakai) W.Lee (uncertain > unassessed )
Breea segetum f. segetum (Bunge) Kitam. (uncertain > unassessed )
Breea setosa (Willd.) Kitam. accepted as Cirsium arvense (L.) Scop.
Breea setosa (Willd.) Soják accepted as Cirsium arvense (L.) Scop.
Carduus ×borderi Rouy accepted as Carduocirsium borderei (Rouy) P.Fourn.
Carduus ×gillottii
Carduus ×nyaradyanus Degen ex Nyár.
Carduus abruzzensis Arènes
Carduus abyssinicus Sch.Bip. accepted as Carduus leptacanthus Fresen. accepted as Afrocarduus leptacanthus (Fresen.) Garcia-Jacas, Moreyra & Susanna
Carduus acanthifolius Lam. accepted as Cirsium oleraceum (L.) Scop.
Carduus acanthium (L.) Baill. accepted as Onopordum acanthium L.
Carduus acanthocephalus C.A.Mey.
Carduus acanthoides d'Urv. (uncertain > unassessed )
Carduus acanthoides Gren. & Godr. (uncertain > unassessed )
Carduus acanthoides Hornem. (uncertain > unassessed )
Carduus acanthoides Huds. (uncertain > unassessed )
Carduus acanthoides L.
Carduus acanthoides Pall. ex M.Bieb. (uncertain > unassessed )
Carduus acanthoides f. acanthoides accepted as Carduus acanthoides L.
Carduus acanthoides f. albiflora (L.) Gross (uncertain > unassessed )
Carduus acanthoides f. mulliganii B.Boivin (uncertain > unassessed )
Carduus acanthoides f. ochranthus Wallr. (uncertain > unassessed )
Carduus acanthoides subsp. acanthoides
Carduus acanthoides subsp. multiflorus (Gaudin) Nyman accepted as Carduus crispus subsp. multiflorus (Gaudin) Franco
Carduus acanthoides subsp. sintenisii
Carduus acantholepis (Hemsl.) Greene accepted as Cirsium acantholepis (Hemsl.) Petr.
Carduus acantholepis Benth. accepted as Alfredia acantholepis Kar. & Kir.
Carduus acarna L. accepted as Picnomon acarna (L.) Cass.
Carduus acaule (uncertain > unassessed )
Carduus acaulescens (A.Gray) Rydb. accepted as Cirsium scariosum var. americanum (A.Gray) D.J.Keil
Carduus acaulis L. accepted as Cirsium acaulon (L.) Scop.
Carduus acaulis Thunb. (uncertain > unassessed )
Carduus acicularis Bertol.
Carduus acuatus Osterh. accepted as Cirsium acutatum
Carduus acuminatus Gaud. ex Rchb. accepted as Carduus acanthoides L.
Carduus adpressus C.A.Mey.
Carduus adpressus subsp. adpressus