I know it is difficult to ID a daylily, but thought I would take a chance on this. My Aunt Alice had this daylily growing for many years at the farm. I am wondering if it could be Hyperion. I am not sure how many of all the older daylilies are yellow like this, but I'm sure there are several. Is it even possible to distinguish between them?
In the clump shot picture, it is about the right height (40 inches) to be Hyperion and it is fragrant. The blooms are about 4 inches. The daylily on the back side is South Seas. The picture is at such an angle that they look the same height, but I was standing downhill a little.