The name Saskatoon is derived from the Cree name for these berries. These were an important and prized part of Indiandiet, preserved for use long after ripening. The Saskatoon Berry Institute of North America swears by them, and has an exhaustive list of nutritional and health benefits. I've often said there are good reasons why wild foods aren't in our markets.
In this case, it's hard to understand. Maybe they have them at Whole Foods? There are lots of serviceberry species, but these are apparently the cream of the crop. The flowers are less remarkable, looking much like all the other Amelanchiers. They're in inch or a little more across. Leaving out places where they are cultivated, they grow in AK, CA, CO, IA, ID, MN, MT, ND, NE, NV, OR, SD, UT, WA, AB, BC, MB, NT, SK, and YT. They have spread from cultivation in WI, NB, ON, and QC.Summit Co CO, 6/17/13.