A great question, Mary Jane.
I have some daylilies that have shown different bloom characteristics on scapes in the same clump, as well as different colors and eye shapes on the same scape. So I think it is possible for daylilies to expresses their genetics in different ways through earlier and later fans or blooms, whether in the stamen, anthers, or by some other readily identifiable variance.
Here is the one I have with consistently different shapes between fans in the same clump, and eye shapes on the same scape. The sometimes square tip on the petal/s, and differently shaped eyes, can be seen from various other's photos in the database entry for it; Savannah Royalty:
Another daylily I have that produced different base colors in each of its blooms from a single scape, one each of lavender, pink, yellow and cream:
Of course, it is always possible you have another cultivar mixed in when there are differences. But, there are also others who seem to have different colors showing on Elisabeth Salter fans from various different gardens, so it is possible it does age or perform with variations that show up, similar to what you have documented:
Dark Anthers, Yellow/Orange range of colors, Light Anthers and flower colors
I'm so glad you've uploaded the picture of your daylily to the database - always great to have them - and whenever there is doubt, the generic daylily page is a good place to start.
