@sooby
When they are up and blooming is not when confusion occurs... it's when we are trying to remember from long ago. Someone I am trying to help is attempting to describe a daylily he remembers from an old cemetery more than 40 years ago... when he visited the region where I live.
And multiflora has at least three different 'types' ... a yellow-gold/orange bloom, a lemon-yellow bloom, and a distinct variant which grows in Vermont. We also add into the mix whether or not the daylily is fragrant... or how fragrant.
And they do not all bloom at the same time, nor do their blooms have the same shape ... as well as height variations. (A place in Vermont grows / sells 15 dif. species, most of which are 'definitely' not any of mine.)
Most people seem to be pursuing cultivars, not species... and I only have 7 species (possibly eight, as I think I have a variant). It's not easy to find accurate photos / descriptions of some of these ... particularly if they were growing wild somewhere or handed down by older generations... So, to be able to say, with certainty, which species a daylily actually belongs to...?
And then there are the "ditch" lilies... and the patches growing in the old cemeteries, that are planted by a stone from the 1800s. Or alongside an old foundation, whose building has been gone for 80 or 100 years. - Can't always be sure 'which' one they are.