ζpseudopanax K.
ζPseudopanax K. Koch. ζ. Philipson, W. R., New Zealand J. Bot. 3 : 333-341 (1965), transferred the spp. treated in Allan (1961) as Neopanax to Pseudopanax. Sykes (1977) reduced the Kermadec Is plant to varietal rank within P. arboreus. Wardle, P., New Zealand J. Bot. 6 : 226-236 (1968), recognised 3 vars for P. colensoi.