The Guide to Species Irises put lazica and ungicularis in different
species. To quote "This species [lazica] is easily separated from
I.unguicularis by its flat, wider, more or less unribbed leaves and
larger fiddle-shaped falls. It also occupies a completely different
ecological niche." The niche referred to is one of a higher rainfall
and lower winter temperatures than the Mediterranean climate of
Ian, in Ottawa where we were down to -11C last night.