Michael,
eu-Sempervivum just means NOT in the Jovibarba genus or subfamily, depending how you decide to accept the taxonomy.
I agree that a blood red hirta type would be very cool.
Last year I self pollinated Jowan as the pollen looked good and got mostly chaff in the seed capsules but ONE seedling appeared. It looks more like a heuffelii type although it has not increased yet.
My Emerald Spring X allioni Yellow Form seedlings are starting to show some differences. The most interesting is one with tiny, many leaved rosettes but in more the stellate form of hirtum. There is a complete continuum between one parent and the other.
Best of luck in your quest!
Kevin
