Bryant, G. 1996: Rare and Unusual Plants for New Zealand Gardens. David Bateman, Auckland.
Heenan, P.B.; de Lange, P.J.; Cameron, E.K.; Champion, P.D. 2002: Checklist of dicotyledons, gymnosperms, and pteridophytes naturalised or casual in New Zealand: additional records 1999–2000. New Zealand Journal of Botany 40(2): 155–174.
Koch, K.H.E. 1853–1854: Hortus Dendrologicus
. Schneider, Berlin.