Cirsium

C. Stace, New flora of the British Isles, ed. 3. 2010E. J. Jäger, Rothmaler, Exkursionsflora von Deutschland, Gefäßpflanzen: Grundband, ed. 20. 2011R. D. Meikle, Flora of Cyprus 2. 1985
1Biennial without rhizomes; stem with basal rosette; leaves with rigid bristles on upperside; involucre 2.4-4(-5) cm wide
1'Perennial with long rhizomes; stem without basal rosette; leaves glabrous or with soft hairs on upperside; involucre 0.7-2.2 cm wide