Hanging bud

After a volunteer shift on 23 July 2014, I wasn't too far away from the Erlton/Roxboro Natural Area, where I was finally going to go on a botany walk. Having been to this location several times before, I knew it was a short, easy, flat trail, and that I could go as far as I wanted and then turn back early, which is what I did. I missed pretty well all the botany and birding walks last year, which was quite depressing. The main thing I wanted to see there were the Nodding / Musk Thistles, as they are my favourite species of Thistle. They are called a "weed", but they are beautiful and I love to see and photograph them.

With a couple of hours to "kill" between volunteering and the walk, I spent them at the Reader Rock Garden, which was just a few minutes' drive away from the evening botany walk location. I'm not sure what plant this attractive opening, bud belonged to. Could it be Campanula persicifolia?