Webb, C.J.; Sykes, W.R.; Garnock-Jones, P.J.; Brownsey, P.J. 1995a: Checklist of dicotyledons, gymnosperms, and pteridophytes naturalised or casual in New Zealand: additonal notes 1988–1993. New Zealand Journal of Botany 33: 151–182.
Webb, C.J.; Sykes, W.R.; Garnock-Jones, P.J.; Brownsey, P.J. 1995b: Checklist of dicotyledons, gymnosperms, and pteridophytes naturalised or casual in New Zealand: additional records 1988–1993. New Zealand Journal of Botany 33: 151–182.