Mabberley, D.J. 2008: Mabberley's plant book, a portable dictionary of plants, their classification and uses. Edition 3. Cambridge University Press.
Ogle, C.C.; de Lange, P.J.; Cameron, E.K.; Parris, B.S.; Champion, P.D. 2021: Checklist of dicotyledons, gymnosperms and pteridophytes naturalised or casual in New Zealand: additional records 2007–2019. Perspectives in Biosecurity Research Series 5: 45–116.
Sweet, R. 1825–1827: British Flower Garden. Vol. 2. James Ridgeway & Sons, London.
Wilcox, M.D. 2012: Auckland's Remarkable Urban Forest. Auckland Botanical Society Bulletin 29: [1]–[348].