Heenan, P.B.; Breitwieser, I.; Glenny, D.S.; de Lange, P.J.; Brownsey, P.J. 1998: Checklist of dicotyledons and pteridophytes naturalised or casual in New Zealand: additional records 1994-1996. New Zealand Journal of Botany 36(2): 155–162.
Linnaeus, C. 1753: Species Plantarum. Impensis Laurentii Salvii, Stockholm.