Synonyms: Sonchidium maritimum (homotypic); Sonchoseris maritima (heterotypic); Sonchus arvensis maritimus (homotypic); Sonchus arvensis var. glaberrimus (homotypic); Sonchus arvensis var. laevipes; Sonchus arvensis var. maritimus (homotypic); Sonchus baburi; Sonchus hieracioides (heterotypic); Sonchus littoralis (heterotypic); Sonchus maritimus cartilagineus; Sonchus maritimus var. canescens; Sonchus maritimus var. maritimus; Sonchus otaviensis (heterotypic); Sonchus pauciflorus (heterotypic); Sonchus vulgaris maritimus (homotypic); Sonchus vulgaris var. normalis (homotypic)