El; A sport is generally considered to be the mutation of a single gene during vegetative growth. That one gene can effect a number of characters but the most common example is a blue Iris producing a white sport or vice versa. The Sport may be fairly stable and continue in the new form for many generations. Example Iris albicans will occasionally have a blue plant appear in a large population of white. The blue form has been registered as Madonna which if my e-mail would allow should be within single quotes. The Botanical rank of Forma is generrally considered to be a single gene difference and can also be named a cultivar. Zua is believed to be a single gene difference and has a crepe like texture to the flower parts. I used to grow it but it has many years since I have seen a plant and eventually would like to find it again. The is also a sport of Zua that is known as Blue Zua, that is blue rather than the lightly blue greyed white of Zua. I can remember I had a slide but it was terribly out of focus.

----- Original Message -----
From: "El Hutchison" <eleanore@mts.net>
To: iris-photos@yahoogroups.com
Sent: Tuesday, June 8, 2010 6:29:12 PM GMT -05:00 US/Canada Eastern
Subject: [iris-photos] Another Question