World Register of Marine Species (WoRMS)
Compositae Working Group (CWG) (2026). Global Compositae Database. Ptilophora nutans (Hook.) A.Gray. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1207874 on 2026-08-29
(1849). Mem. Amer. Acad. Arts ser. 2, 4(1)