 It has a chromosome count of 2n=44.It has been counted several times 2n=44, Randolph 1934 (ex Randolph & Mitra in Bulletin of the American Iris Society 140, in 1956) 2n=44 Riley 1942, 2n=42, R C Foster 1937 (as Iris hexagona var.giganticaerulea) and 2n=44, Randolph, 1966.