Click through the pic: it's zoomed-in, but otherwise unaltered. I have no idea why it turned out looking more like a painting than a photograph. Looks like brush strokes.
Apparently there are 29 goldenrod species in Ontario (32 in Canada), and 'the' book a native plant girl should buy is "Goldenrods of Ontario" by John Semples and Gordon S. Ringius, University of Waterloo. I'll have to call U. of Waterloo bookstore to see if they still have copies.