The American iris Society was founded in 1920.
The British Iris Society was founded in 1922. They celebrated their 90th Anniversary in 2012.
http://www.britishirissociety.org.uk/index.html
The Canadian Iris Society was founded in 1946 with W. J Moffat as the first president. It functioned as a region of the American Iris Society until 1958 when it was reorganized independently.
http://www.cdn-iris.ca/history.html
WayneMesser - 2013-01-10