Jane Grushow: Campanulas -- http://server1.fandm.edu/people/j_grushow/genus.html
Pennsylvania rock garden enthusiast presents photos and brief information for four small perennial species.
Growing Campanulas -- http://groups.msn.com/jeffsohiowatergarden/growingcampanulas.msnw
Overview article discussing characteristics, cultivation, and propagation of campanulas in general, with a listing of species.
Bellflowers -- http://www.geocities.com/heartland/garden/4395/bellflowers.html
Provides characteristics of the various groups in the genus, with photos of several species.
Paghat's Garden: Rose Canterbury Bell -- http://www.paghat.com/campanula.html
Entry point into more than a dozen pages, each describing a different campanula species or cultivar, with characteristics and photos for each.
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