Sue is right, the search engine unfortunately ignores any word that has 3 letters or less, and that's a limitation of the software I'm using to run the search and it can't be changed.
That beta search Sue linked to is the right place to find cultivars. In time (soon, hopefully) I'll have that out of beta and that page will be prominent and easily accessible, and once that happens the general search will be a feature that is used much less.
