I clipped the descriptions of both species from the site you linked to Lori, easier to compare!
http://linnet.geog.ubc.ca/Atla...
Polemonium pulcherrimum certainly looks more common, unless it's a garden plant, and I don't know the location of dirtdorphins.
http://linnet.geog.ubc.ca/Atla...
One of the big differences which stand out to me is the description of the leaves, for boreale it states "elliptic to oval" and for pulcherrinum "egg-shaped to circular". These leaves look very close to circular to me.
