Cirsium pectinellum var. pectinellum Cirsium mamiyanum Cirsium kamtschaticum subsp. pectinellum Cirsium pectinellum var. fallax Cirsium pectinellum var. angustilobum Cirsium pectinellum var. modestum Cirsium modestum Cnicus pectinellus Cirsium pectinellum var. shikotanense
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024