Amethyst Toadflax
Linaria amethystea
Credits: 
M. Porto, www.flora-on.pt

Small endemic plant of the Iberian Peninsula, with a fragmented distribution throughout Portugal, except for the northern coastline. It occurs both in cultivated and abandoned land and, less frequently, in littoral sands. Its flowering season is from February to June and the flowers can be blue-violet, yellow or white.