@Char, I decided to continue my search in this thread. I'm also going to use this thread to document my progress (so I always know where to go to see what I've found), if that's okay.
As a separate note, you don't happen to be fluent in French or know someone on this site who is, do you? I am trying to find potential leads at the moment by tracking down Primos' other cultivars, and I just happened upon a website a few moments ago that
seems to have people discussing Primos's 'Mayola Swan' daylily and where to get it. I plugged the three visible comments into Google translate and they said something about "this cultivar" in it...so I'm pretty sure the comments were related to Mayola Swann, and not daylilies in general....and they were talking about a particular place (in Belgium?) in which to get it. (This is the first place I've found that gives any indication to *anyone* having a Primos cultivar...I'm still looking, though.)
Anyway, long story short, if there's someone who is fluent in French, who could breeze through the comments on the page (link below) and confirm my suspicions that they are talking about where to get Mayola Swann, that *might* be a step in the right direction. It looks like they are saying that "Les Botaniques du Val Douve" had it (but is out?) and
Here is the link:
http://www.jardinsdugue.eu/enc...
Edited to add: The French site also lists daylily "Elizabeth Fancher":
http://www.jardinsdugue.eu/enc...
...and Margaret Buchanan:
http://www.jardinsdugue.eu/enc...
