From Rich Ring, Natural Heritage: I went to a New England Botanical Club workshop in Asters this weekend, led by Arieh Tal. It was a good workshop emphasizing the common species, and Tal has developed some unusual, artificial keys that worked pretty well, and has some very good photography on his site. His website with photos and keys of Asters and Goldenrods is http://www.nttlphoto.com/botany/asters-goldenrods/a&g_main.htm.