Using the ATP "Iris Database" I came up with 21 possibilities. I searched for the following attributes:
White
Self
Pronounced Fragrance.
First: Click on the "Iris Database" on the Iris Forum's main page. (It is on the right side of the page towards the top). Then hit the "Search by Characteristics" on the top left of the search page. Then fill out what characteristics you want to search for.
Change the list by taking out "pronounced" and add "sweet".