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.
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.