Here are some links to other noteworthy ogranizations with resources for learning about irises and irids.
North American Rock Garden Society has an annual seed exchange for members only, http://www.nargs.org/
Pacific Bulb Society has frequent bulb & seed exchanges for members only, http://www.pacificbulbsociety.org/
British Iris Society, http://www.britishirissociety.org.uk/
Canadian Iris Society, http://www.cdn-iris.ca/
Iris Society of Australia, http://www.irises.org.au/
American Iris Society, http://www.irises.org/
Society for Pacific Coast Native Iris, http://www.pacificcoastiris.org/
Society for Louisiana Irises, http://www.louisianas.org/
Aril Society International has an annual seed exchange of aril iris species (oncocyclus, regelia, etc.) and their hybrids, http://www.arilsociety.org/
North American Native Iris, http://facstaff.hsc.unt.edu/rbarton/Iris/NANI.html
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