Today’s flower is an interesting one (and a native, to boot!) – woolly gromwell (Lithospermum ruderale). According to Plants of Alberta (France Rover, Richard Dickinson), there are only thirty species of the Borage family growing wild in Alberta, of which this is one. In early summer, the west slopes of Nose Hill here in Calgary are dotted with these strange spiky-leaved plants, in full bloom.
What ruderal plants are common where you live? I always think of fireweed (Epilobium angustifolium, syn. Chamerion angustifolium) – in mid-summer, it is simply spectacular in roadside ditches and in mountain meadows.