Acrocentron boissieri Webb accepted as Centaurea attica Nyman (original description)
Acrocentron granatense Webb accepted as Centaurea granatensis Boiss. ex DC. (original description)
Acrocentron ornatum Webb accepted as Centaurea ornata Willd. (original description)
Carduncellus dianius Webb (original description)
Cynara lamyroides Webb accepted as Cynara baetica (Spreng.) Pau (original description)
Klasea cichoracea (L.) Webb accepted as Klasea flavescens subsp. cichoracea (L.) Greuter & Wagenitz (original description)
Klasea pinnatifida Webb (original description)
Lamyra hispanica Webb (original description)
Lepteranthus linifolius Webb (original description)
Lyonnetia abrotanifolia Webb (original description)
Perideraea Webb accepted as Chamaemelum Mill. (original description)
Perideraea fuscata (Brot.) Webb accepted as Chamaemelum fuscatum (Brot.) Vasc. (original description)
Senecio viscosus Webb (original description)
Seridia sphaerocephala Webb (original description)
Triplocentron sulphureum Webb (original description)