Cirsium acaulon (L.) Scop., Annus Hist.-Nat. 2: 62. 1769 Cirsium acaulon (L.) Scop., Annus Hist.-Nat. 2: 62. 1769is new combination for Carduus acaulos L., Sp. Pl.: 1199. 1753has orthographic variant Cirsium acauleTaxon for this nameCirsium acaulon (L.) Scop., Annus Hist.-Nat. 2: 62. 1769