As I understand it from the Starr book, A. parryi ssp. parryi is further divided into 4 or so varieties including var. truncata, so strictly speaking the umbrella ssp. parryi should be valid for truncata. But I agree with you, I would think that a separate page for var. truncata would be vastly more helpful as it is (like you say) much more common and distinctive. I am going to propose that one be added to the database, especially given that one for var. huachucensis already exists. Then maybe with your help those images could be sorted out.
I have commented on the two pictures I was sure were not any kind of parryi... please do the same if other plants strike you as misidentified.
