WILLIAM MOHR AB (Mohr-Mitchell, 1925).   Introduced even before the color codes were developed this was classified as an S7M, which was translated as a "Pink to red-toned blend, self, medium" for the 1976 Checklist.  Although this was corrected in a subsequent errata, the description has unfortunately been repeated many times down through the years.  The Court of Iris said: "Huge lilac flowers have veins of deeper violet" and the photo confirms this.  Parisiana X I. gatesii.