Taxonomy fide Merrill in Journ. Arn. Arb. xxxi.280 (1950)
Taxonomy fide Merrill in Journ. Arn. Arb. xxxi.280 (1950) [details]
Compositae Working Group (CWG) (2021). Global Compositae Database. Johannia excelsa (D.Don) Oken. Accessed at: https://www.compositae.org/aphia.php?p=taxdetails&id=1121931 on 2025-03-26