As luck would have it, I ran across the actual plant up in British Columbia and snapped a picture of it for future reference. It's quite pretty and was in bloom late July. We also visited our property during this same road trip and I didn't spot any signs of it (it's very eye catching). I also had a telephone conversation with a helpful woman at the Weed Board who told me our particular area was not heavily infested. As our county is over 5,000 square miles, one would think they'd have some sort of distribution map showing the infected areas, but apparently no. Shrug.
