Along the way to my next stop I passed by a cute little garden shop that happened to have semponiums.

Semponiums are a novel hybridization of sempervivums and aeoniums. They only came on the market in the last couple years, and I think there are only four kinds. I finally found the last one I needed for the complete set: Mrs. Frosty

(For some reason this is the only one with a dumb name)