 It has been counted several times, 2n=42, Simonet, 1934; n=21, 2n=42, Chimphamba, 1973 and 2n=32, Pringle, 1976.It is normally published as 2n = 32, 42.The Latin name is pronounced "Iris" (EYE-ris) "lacustris" (lak-US-triss).