sooby said:From past experience I would have to disagree with you, at least on the "most often" part, Larry 
Are you thinking that most people believe a rhizome is a kind of root? Or that they know it is a stem but call it a root anyway?
Yes, to both of those.
Edited to add, IMHO it is important to make the distinction because otherwise new daylily gardeners might think any piece of root left behind when digging up a daylily could regrow. Not all daylilies have rhizomes.
I think "new daylily gardeners" and those who are daylily growers for years and years, and even a lot of more "into daylily" growers would not know the difference and really will never bother to learn the difference. They just enjoy growing the plants. I can't name how many times I have spoken to old time daylily farm owners, who insist that daylilies "revert" back to ditch lilies, or Kwanso, or Flore Pleno or whatever was left behind in the bed.
