1. Allan, H. H. 1961.“Flora of New Zealand”, Vol. I, 1085–1085. Wellington: Government Printer.
2. Cheeseman, T. F. 1925.“Manual of the New Zealand Flora”, 2nd, 1163–1163. Wellington: Government Printer.
3. Cockayne, L. 1928.“The Vegetation of New Zealand”, 2nd, 456–456. Leipzig: Engelmann.