Not my favourite subject

I have not yet been able to find the ID for this rather attractive spider. Makes me shudder when I see this photo, as it brings back memories of getting out of the car with two friends when we took a 4-day road trip down to SE Alberta from Calgary. We walked just a short distance into a flat area to check for any lichens, liverworts or mosses - and I looked for anything else of interest. They called me over to see this beautiful spider and I tried to get some macro shots of it, in very strong winds. After I'd tried from every possible angle, we suddenly realized that every few inches, there was yet another of these spiders on its web. They were absolutely everywhere! Ha, spiders are not my favourite things - yikes! Did we get out of there fast? Of course we did! Taken on 21 September 2013, "somewhere" in SE Alberta.