• Adler (1994), S.880
• Binz (1986), S.501
• CCDB - Link (12.8.2022)
• Flora Gallica (2014), S.134
• Flora Helvetica (2012), Nr.2380
• Flora Italiana - Link (12.8.2022)
• Hess (1976ff), Bd.3, S.223
• info flora - Link (12.8.2022)
• Markgraf (1981), S.194ff
• Oberdorfer (2001), Nr.160a
• Pignatti (1982), Vol.3, Nr.4504
• Rothmaler (2002), S.136
• Tela Botanica - Link (12.8.2022)
• World Flora Online - Link (12.8.2022)

Foto: Dr. Mary Gillham Archive Project,  https://www.flickr.com/photos/marygillhamarchiveproject/34388714862/