When I was "younger" in the knowledge of Pinguicula, I was always afraid as my flowers sometimes were different from the "official species" pictures shown in litterature for exemple. I always thought that I was growing a mislabelled plant. Now, as I get a little older and as I visited few sites with plants in flowers, I am not affraid now.
I work on a new article on this subject, here is a preview. Hope you will enjoy.