Bryant, G. 1996: Rare and Unusual Plants for New Zealand Gardens. David Bateman, Auckland.
Kunth, K.S. 1850: Enumeratio plantarum omnium hucusque cognitarum, secundum familias naturales disposita, adjectis characteribus, differentiis et synonymis. Vol. 5. J.G. Cottae, Stutgardiae et Tubingae [Stuttgart and Tübingen].
Mabberley, D.J. 2008: Mabberley's plant book, a portable dictionary of plants, their classification and uses. Edition 3. Cambridge University Press.