While on a wildflower walk this morning in Big Sky, MT on my property at 8,000' elevation, I noticed a particularly light colored Harebell (Campanula rotundifolia) which I thought might be of interest to forum members. The two attached photos depict the light colored plant as well as a more traditionally colored individual less that two feet distant.
Colour variation is a relatively common occurrence in Campanula spp. See: Campanula piperi as another example. The Campanula rotundifolia where I grew up in Manitoba is generally differently-coloured overall (lighter) than the Campanula rotundifolia I see in the PNW. PS Great to have some property at 8000'!
Yes, I have a self-seeded population of Campanula rotundifolia (originally from wild seed) in my front yard and see quite a lot of flower colour variation:
