Becky, the only one I have that's truly mine, I've had for years and it's an unnamed butter yellow. It's in the ground and last year did not stick it's head up till mid June after our unusual long bitter cold winter. I thought I'd lost it. Of course it didn't bloom!
I was late in taking cuttings last fall and we got a surprise frost, I was only able to get one to survive. Normally, I don't take cuttings from it. But after joining ATP and reading the brug posts, I realized why it seldom blooms, and why it blooms so late the few years that it does. I found out about it having to put on enuf growth to make that Y to ever bloom. So with mine freezing back to ground every year, I doesn't put up till late mid to May, then it has to grow all summer. Just about frost if I'm lucky, it's ready to bloom. The heartbreaker some years is when the buds never get to open and I can't protect them long enuf for them to open.
so last year I made up my mind I was going to become a pot grower and keep them going. And maybe finally, I too could enjoy some blooms!!!
Anyway, when my yellow gal sticks her head up and puts on enough growth, I'll be happy to root you some of her. I just call her Susy Sunshine. But by no means was she named. I've had her 15+ years. Just keeps coming up in that same spot. It's a very old plant.