Were you using the boldface 'Daylilies' category area to access the list? That only works if daylilies are checked off on their listing. I went and looked and it wasn't. I proposed a change, so if that is approved, then you'll be able to find it by going the 'Daylilies' vendors. Otherwise you'll have to ignore that and use the alphabet at the bottom.
It's an area where it would be really nice for the vendors on the list to come and edit the info into the categories they sell so it will direct potential shoppers to them. I'm sure not all the daylily specialty growers have that box checked. In a search under the daylily category, they won't appear.