Carr, Gerald (1997-03-20). "Argyroxiphium virescens Hillebrand". Hawaiian Silversword Alliance. University of Hawaii. Archived from the original on 18 September 2009. Retrieved 2009-11-01.
iucnredlist.org
Bruegmann, M. M.; Caraway, V. (2003). "Argyroxiphium kauense". The IUCN Red List of Threatened Species. Retrieved July 6, 2024.
Carr, Gerald (1997-03-20). "Argyroxiphium virescens Hillebrand". Hawaiian Silversword Alliance. University of Hawaii. Archived from the original on 18 September 2009. Retrieved 2009-11-01.