For those of you interested in Carex who don't happen to own the wonderful two volume set by Kenneth Kent Mackenzie, "North American Cariceae," you might be as pleased as I was to discover that the illustrations from the books have been put on the web by the Texas A&M Bioinformatics Working Group:
http://www.csdl.tamu.edu/FLORA/carex/carexout.htm

happy botanizing!,
Rick