Arlene: I believe it is.I bought a Lights mix and the Rhub and Cust as well as their Best Darks.When I look at the light colored ones they see so similar I just cant tell.The other light colored ones are doubles.
Process of elemination led me to RC.The sun thru the petals is a real clue,seems to be yellow cream with red edges.
I took advantage of a Pine Knot sale and bought more darks.The order came in 3 days.Fabulous packing and nice big plants
I wanted all dark colors but he said they were in short supply.The double pink spotted is paler but Its such a pretty I will put all in my hosta garden thats 2 years old.