It is a Linaria and probably one of the supina group although that
leads us into on of the largest aggregations within Linaria, which is
not too helpful. Judging by the apparently thickened, obtuse-
mucronate leaves, I suspect it's origins are Mediterranean and a plant
of the maquis or similar habitats. Given a warmer, drier climate on
poorer soil, the leaves would not normally be as broad. The flower
colour is wrong for supina, so I'm tempted to think along the lines of
L. depauperata, which has several subspecies, or at least a primary
hybrid with depauperata as a parent. That's about as far as I can
go. I grew L. supina and depauperata many years ago during a brief
phase when I was slightly 'into' alpines and rockery plants.
Seedlings from them did exhibit varying degrees of veining, as well as
colours from yellow to white in supina and off-white to purplish in
depauperata.