Thanks to Not a Number, I just read the Volume 62, no. 1 Castanea issue, and the subject article. I think it does indicate that the original authors meant to publish the variety in question as, Sarracenia purpurea subspecies venosa variety montana. Just follow the info provided by Not a Number, and you can check it out for youselves. The caption and photo in the article are the same that Donald Schnell uses in his 2002 edition of Carnivorous Plants of the United States and Canada.
I still await Jan Schlauer's illumination of this taxon. I don't have near the expertise in taxonomy that he has. If this is an oversight on his part, I will be flabbergasted.