Every accepted species in the genus is listed. A name links to its page when we hold at least three commercially licensed photographs of it. Where we do not, the row shows how many we actually found, which is usually none.
| Species | Authority | Usable photographs | Page |
|---|---|---|---|
| Carduus nutans | L. | 3,009 | documented |
| Carduus crispus | L. | 1,361 | documented |
| Carduus crispus | Guirao ex Nyman | 1,361 | documented |
| Carduus acanthoides | L. | 1,153 | documented |
| Carduus pycnocephalus | L. | 1,001 | documented |
| Carduus defloratus | L. | 288 | documented |
| Carduus tenuiflorus | Curtis | 266 | documented |
| Carduus uncinatus | M.Bieb. | 95 | documented |
| Carduus macrocephalus | Coss. ex Willk. & Lange | 77 | documented |
| Carduus personata | (L.) Jacq. | 67 | documented |
| Carduus squarrosus | DC. ex Lowe | 41 | documented |
| Carduus spachianus | Durieu | 40 | documented |
| Carduus nigrescens | Vill. | 35 | documented |
| Carduus carlinoides | Gouan | 19 | documented |
| Carduus hamulosus | Ehrh. | 14 | documented |
| Carduus maroccanus | (Arènes) Kazmi | 12 | documented |
| Carduus carpetanus | Boiss. & Reut. | 11 | documented |
| Carduus chrysacanthus | Ten. | 8 | documented |
| Carduus collinus | Waldst. & Kit. | 8 | documented |
| Carduus argyroa | Biv. | 7 | documented |
| Carduus argentatus | L. | 6 | documented |
| Carduus clavulatus | Link | 5 | documented |
| Carduus numidicus | Coss. & Durieu | 4 | documented |
| Carduus litigiosus | Nocca & Balb. | 3 | documented |
| Carduus adpressus | C.A.Mey. | 2 | below the evidence gate |
| Carduus asturicus | Franco | 2 | below the evidence gate |
| Carduus myriacanthus | Salzm. ex DC. | 2 | below the evidence gate |
| Carduus cephalanthus | Viv. | 1 | below the evidence gate |
| Carduus corymbosus | Ten. | 1 | below the evidence gate |
| Carduus meonanthus | Hoffmanns. & Link | 1 | below the evidence gate |
| Carduus × aragonensis | Devesa & Talavera | 0 | below the evidence gate |
| Carduus × camplonensis | Devesa & Talavera | 0 | below the evidence gate |
| Carduus × cantabricus | Devesa & Talavera | 0 | below the evidence gate |
| Carduus × conjugens | R.E.Fr. | 0 | below the evidence gate |
| Carduus × cyrneus | Schlüssel & Jeanm. | 0 | below the evidence gate |
| Carduus × ipe | Boros | 0 | below the evidence gate |
| Carduus × orthocephalus | Wallr. | 0 | below the evidence gate |
| Carduus × septentrionalis | Devesa & Talavera | 0 | below the evidence gate |
| Carduus × vigoi | Mateo | 0 | below the evidence gate |
| Carduus abruzzensis | Arènes | 0 | below the evidence gate |
| Carduus acanthocephalus | C.A.Mey. | 0 | below the evidence gate |
| Carduus acicularis | Bertol. | 0 | below the evidence gate |
| Carduus affinis | Guss. | 0 | below the evidence gate |
| Carduus afromontanus | R.E.Fr. | 0 | below the evidence gate |
| Carduus albescens | Rouy | 0 | below the evidence gate |
| Carduus amanus | Rech.f. | 0 | below the evidence gate |
| Carduus aurosicus | Vill. | 0 | below the evidence gate |
| Carduus baeocephalus | Webb | 0 | below the evidence gate |
| Carduus bourgaeanus | Boiss. & Reut. | 0 | below the evidence gate |
| Carduus bourgaei | Kazmi | 0 | below the evidence gate |
| Carduus broteroi | Welw. ex Cout. | 0 | below the evidence gate |
| Carduus brunneri | Döll | 0 | below the evidence gate |
| Carduus budaianus | Javorka. | 0 | below the evidence gate |
| Carduus calabricus | Arènes | 0 | below the evidence gate |
| Carduus candicans | Waldst. & Kit. | 0 | below the evidence gate |
| Carduus canduelis | Gren. | 0 | below the evidence gate |
| Carduus carduelis | (L.) Gren. | 0 | below the evidence gate |
| Carduus chevallieri | Barratte ex Chevall. | 0 | below the evidence gate |
| Carduus conjungens | R.E.Fr. | 0 | below the evidence gate |
| Carduus conrathii | Hayek | 0 | below the evidence gate |
| Carduus dahuricus | (Arènes) Kazmi | 0 | below the evidence gate |
| Carduus dubius | Balb. | 0 | below the evidence gate |
| Carduus edelbergii | Rech.f. | 0 | below the evidence gate |
| Carduus estivali | Arènes | 0 | below the evidence gate |
| Carduus euboicus | Franco | 0 | below the evidence gate |
| Carduus fallax | Borbás | 0 | below the evidence gate |
| Carduus fasciculiflorus | Viv. | 0 | below the evidence gate |
| Carduus getulus | Pomel | 0 | below the evidence gate |
| Carduus gillotii | Rouy | 0 | below the evidence gate |
| Carduus grassensis | Briq. & Cavill. | 0 | below the evidence gate |
| Carduus grenieri | Sch.Bip. ex Nyman | 0 | below the evidence gate |
| Carduus halanensis | Degen & Lengyel | 0 | below the evidence gate |
| Carduus heteromorphus | Sennholz | 0 | below the evidence gate |
| Carduus hohenackeri | Kazmi | 0 | below the evidence gate |
| Carduus ibicensis | (Devesa & Talavera) Rosselló & N.Torres | 0 | below the evidence gate |
| Carduus intercedens | Hausskn. | 0 | below the evidence gate |
| Carduus jordanii | Arènes | 0 | below the evidence gate |
| Carduus juratzkae | Beck | 0 | below the evidence gate |
| Carduus keniensis | R.E.Fr. | 0 | below the evidence gate |
| Carduus kerneri | Simonk. | 0 | below the evidence gate |
| Carduus kirghisicus | Sultanova | 0 | below the evidence gate |
| Carduus kumaunensis | (Arènes) Kazmi | 0 | below the evidence gate |
| Carduus lanuginosus | Willd. | 0 | below the evidence gate |
| Carduus leptacanthus | Fresen. | 0 | below the evidence gate |
| Carduus leptocephalus | Peterm. | 0 | below the evidence gate |
| Carduus leptocladus | Durieu | 0 | below the evidence gate |
| Carduus leridanus | Devesa & Talavera | 0 | below the evidence gate |
| Carduus lesurinus | Rouy | 0 | below the evidence gate |
| Carduus littoralis | Borbás | 0 | below the evidence gate |
| Carduus lobulatus | Borbás | 0 | below the evidence gate |
| Carduus loretii | Rouy | 0 | below the evidence gate |
| Carduus lusitanicus | Rouy | 0 | below the evidence gate |
| Carduus macracanthus | Kazmi | 0 | below the evidence gate |
| Carduus majellensis | Huter, Porta & Rigo | 0 | below the evidence gate |
| Carduus malyi | Greuter | 0 | below the evidence gate |
| Carduus maritimum | Elmer | 0 | below the evidence gate |
| Carduus martinezii | Pau | 0 | below the evidence gate |
| Carduus meratii | Arènes | 0 | below the evidence gate |
| Carduus merxmuelleri | Kazmi | 0 | below the evidence gate |
| Carduus millefolius | R.E.Fr. | 0 | below the evidence gate |
| Carduus mixtus | Corb. | 0 | below the evidence gate |
| Carduus modestii | Tamamsch. | 0 | below the evidence gate |
| Carduus moritzii | Brügger | 0 | below the evidence gate |
| Carduus naegelii | Brügger | 0 | below the evidence gate |
| Carduus nawaschini | Bordz. | 0 | below the evidence gate |
| Carduus nervosus | K.Koch | 0 | below the evidence gate |
| Carduus nyaradyanus | Degen ex Nyarady | 0 | below the evidence gate |
| Carduus nyassanus | R.E.Fr. | 0 | below the evidence gate |
| Carduus occidentalis | Nutt. | 0 | below the evidence gate |
| Carduus olympicus | Boiss. | 0 | below the evidence gate |
| Carduus onopordioides | Fisch. ex M.Bieb. | 0 | below the evidence gate |
| Carduus onopordoides | Fisch. ex M.Bieb. | 0 | below the evidence gate |
| Carduus onopyxos | Hill | 0 | below the evidence gate |
| Carduus pancicii | Sch.Bip. ex Nyman | 0 | below the evidence gate |
| Carduus peisonis | Teyber | 0 | below the evidence gate |
| Carduus poliochrus | Trautv. | 0 | below the evidence gate |
| Carduus pseudohamulosus | Beck | 0 | below the evidence gate |
| Carduus puechii | Coste | 0 | below the evidence gate |
| Carduus ramosissimus | Pančić | 0 | below the evidence gate |
| Carduus rechingerianus | Kazmi | 0 | below the evidence gate |
| Carduus rivasgodayanus | Devesa & Talavera | 0 | below the evidence gate |
| Carduus ruwenzoriensis | S.Moore | 0 | below the evidence gate |
| Carduus sardous | DC. | 0 | below the evidence gate |
| Carduus schimperi | Sch.Bip. | 0 | below the evidence gate |
| Carduus schulzeanus | Ruhmer | 0 | below the evidence gate |
| Carduus seminudus | M.Bieb. | 0 | below the evidence gate |
| Carduus semiperegrinus | Aellen | 0 | below the evidence gate |
| Carduus sepincolus | Hausskn. | 0 | below the evidence gate |
| Carduus silvarum | R.E.Fr. | 0 | below the evidence gate |
| Carduus solteszii | Budai | 0 | below the evidence gate |
| Carduus thracicus | (Velen.) Hayek | 0 | below the evidence gate |
| Carduus tmoleus | Boiss. | 0 | below the evidence gate |
| Carduus transcaspicus | Gand. | 0 | below the evidence gate |
| Carduus turocensis | Margittai | 0 | below the evidence gate |
| Carduus vaillantii | Arènes | 0 | below the evidence gate |
| Carduus verlotii | Arènes | 0 | below the evidence gate |
| Carduus weizensis | Hayek | 0 | below the evidence gate |
This site is commercial, so it can only publish photographs licensed for commercial use. Roughly three quarters of the photographs on iNaturalist are CC BY-NC, which excludes them. A species needs at least three usable photographs before we will build it a page, because a page with one picture and no traits tells you nothing you could not get from a search result, and generating hundreds of thousands of those is precisely the practice that got the previous version of this site deleted.
So the species above without a link are not errors and they are not omissions. They are real, accepted plants that we cannot yet document to the standard we hold ourselves to, and the count in the photographs column is exactly how far short we fall.