Great photos of those gratrixianums!!
Tyrone, of couse I had a look at th flower in your link before I wrote my statement. And even now after reading your response I wouldn't change it. O.k. the shape of the staminode is similar (as far as you can see it in the photo). The staminodes of P. gratrixianum, villosum and insigne are at least similar. The rest of the flowers distiguishs in my eyes, such as flower morphology, geometry, colouration of the whole flower etc.. In my eyes it's a hybrid, can't say which, maybe in between a primary hybrid and a complex hybrid but closer to the complex one.GuRu, did you look at the images in that link of linebred plants? There is no big difference between those flowers and the one above. Even the staminodes are the same.