Jenny Cich of the Lincoln Iris Society has a great item with that title in the September 2017 issue of the LIS Rainbow Messenger, their newsletter.  She would like to make a submission to the Reblooming Iris Society on behalf of LIS of irises that rebloom in their zone (5).  She includes a list of the tall bearded irises reported by RIS to rebloom in zone 5 or lower which is very interesting.  Can you help her?  See the details in the newsletter(PDF).