Dave really worked some magic with irises here at ATP. If a variety was ever officially registered, there's a 99%+ chance it's already in the database. Usually, you can easily find a variety by simply going to the Iris Database (
The Irises Database) and typing its name in the search box in the top center of the page (right below the hyperlink that says "Access the generic Irises entry"). Occasionally, if an iris uses really common words in its name, the list of possibilities might be longer than the system can display. In that case, just click the "Browse the full list of irises" and you get to this page:
http://garden.org/plants/brows... and they are all there, listed in alphabetical order.
Lastly, if you know some information about an iris, but can't remember its name, there's a good chance you can find it using the "Search by characteristics" hyperlink:
http://garden.org/plants/group.... For example, if you knew an iris was hybridized by Grosvenor and he registered in 1994, just type Grosvenor in the Hybridizer field and 1994 in the Year of Registration field. Click the Search! button and you'll get a list of every iris he registered that year.