This OP seedling is from another unknown older yellow FL from my work. It didn’t flower last year at all, so I ha-ven’t thought much about it until it open up.
It’s nice with some surprises 
Bo
Congrats Bo! It reminds me of ‘Sunsprite’. I wonder if that’s your mystery Floribunda?
Hi Rob
I am unsure of the mother rose, but it could be Sunsprite as you mentioned. The picture below I the unknown mother rose.
It sets freely lost of hips and the seeds have a high germination rate, so it is useful, but still unknown…
Bo
Nice color Bo. Good luck with this one.