Definitely it isn't a P. concolor var. striatum....not only the flower markings of striatum are missing but also the leaves aren't typically concolor like. At least in my eyes.......Nice flower anyway.
Our compatriot, Birgit's pic shows the genuine article (btw. our = not pluralis majestatix, but I encompas P.K.Hansen and myself)! But very likeable concolor - and I think, one with this species has to allow for a huge variety, when it comes to the leaves!