The xBarbatum hybrid (a naturally occuring hybrid between Simsii and Spathulatum, which are both high altitude species) might be more common (even though, I personally haven't seen it). I was talking with someone in the UK, and he claimed it survived -8C
He said "A. spathulatum is more frost tolerant than simsii. At least here. So the hybrid between these two parents is tough, my x barbatum was barely damaged at -8C with two weeks below freezing day/night one bad winter"
Paul S said: Simsii from Roque Nublo, Gran Canaria
Spathulatum from Tenerife
XBarbatum, bought as simsii
