Gulf Coast Daylily Society of Southeast Texas

The American Hemerocallis Society maintains a database of 55,921 registered daylily cultivars.

You can search by cultivar name, by hybridizer, by date of registration and other fields.

Click here to to to the AHS REGISTRY OF DAYLILY CULTIVARS

Another excellent tool is Tinkers Garden Daylily Database, the largest database with pictures.  Click here to go to TINKERS GARDEN DAYLILY DATABASE.