Hi twitcher;
Feuerrad and Jowan (with "w" or Jovian - both are known hybrids) are S. x nixonii - hybrids; S. x nixonii is a cross of S. globiferum x S. heuffelii;
there are 4 different nixonii-groups:
S. x nixonii (x kwediana): S. globiferum ssp. allionii x S. heuffelii
S. x nixonii (x mitchellii): S. globiferum ssp. arenarium x S. heuffelii
S. x nixonii (x nixonii): S. globiferum ssp. globiferum x S. heuffelii
S. x nixonii (x smithii): S. globiferum ssp. hirtum x S. heuffelii
the botanics put them together to S. x nixonii;
they are all hybrids without sempervivum - clean jovibarba-hybrids;
the breeder who made the most experiences with this hybrids was Cornelis Versteeg from Netherlands;
greatings
Peter
