World Register of Marine Species (WoRMS)
Cirsium horridulum f. elliottii (Torr. & A.Gray) Fernald
Compositae Working Group (CWG) (2026). Global Compositae Database. Cirsium horridulum f. elliottii (Torr. & A.Gray) Fernald. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1240930 on 2026-08-29
(1842). Fl. N. Amer. (Torr. & A. Gray) 2