Hi Mark,
I only have one carmenae x lauii - at least that I am aware of. I have a carmenae (no field number) that on its first few flowers of the season shows a little pink in them, but that fades very quickly and all the rest of the flowers that come later are typical yellow of carmenae.
Here's the carmenae x lauii, owing much to lauii in the flowers at least.
I'm sowing seeds of carmenae with field collection numbers, so I hope for some purity in due course!
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Chris43, moderator