While we are not aware of a specific list of Zone 2 plants, there are several possibilites:
-2 websites and their links are quite informative -
www.coldclimategardening.com and
www.northerngardening.com. You could certainly email the sites and ask for lists of Zone 2 plants they might be aware of. There are a number of books written, or co-authored by Lois Hole and almost all the plants she lists are hardy to zone 3 colder, and she gives excellent advice on cold-weather gardening as well. Nurseries in Alberta that carry mail order plants (and thus have websites) are often excellent sources of information as well. Lastly, the Edmonton Botanical garden, and other Botanical Gardens in very cold climates would be worth contacting.