ontariowildflowers.com is a pretty good site. I'm no wildflower expert, so being able to look up a flower you come across in the woods is rather useful. I did this with the shot of hepatica (I'll blog it in a bit) I took this past Saturday while out with Janneke and Lewis. If I may be so bold, I think my photo of hepatica is a lot better than the one on the ontariowildflowers site.