So far there are three reblooming diploid MTB seedlings that have been derived from Iris cengialtii pollinated by 'Clown Pants' (which is a cross of two species - Iris variegata X Iris suaveolens var. mellita). Two have been registered with the American Iris Society as 'Cricket Song' and 'Easy Smile'.
These two irises bloomed in early summer and again in the fall of 2006, 2007 and 2008. In 2009 they bloomed in early summer (May) and then repeated throughout most of the summer (June and July, and August too for 'Easy Smile') but look like they won't be fall blooming because it's been so dry.