A great site Andreap. Look at the link below and see the links to Sempervivum sites that are listed at the end. We are not short on information. Here is a link that might be useful: More semp links for you

jmcat - Pretty simple really once you begin to understand taxonomic nomenclature, genetics and natural evolution. Papilio polyxenes polyxenes is the nominate form... and Papilio polyxenes asterius is one of it's named subspecies. So some confusion is common when listings lump any bug into a generalized species name like this by not including the next subordinate level of classification if they are assigned - subspecies. Subspecies are named usually because they differ from the nominate form for any of several possible reasons (environment/habitat, isolation, distribution, etc) to where they have evolved into a slightly different bug than the nominate form. In this case the range of the nominate form is Cuba, and except for possible strays it probably doesn't intergrade naturally with the subspecies of it found in their own ranges outside of Cuba, while the subspecies who do have over-lapping ranges probably do intergrade naturally. Hmmm, maybe in better laymanÂs terms, the P. p. polyxenes nominate form is mostly isolated in Cuba. So the named subspecies of it are probably the result of strays of the nominate species that established new colonies outside Cuba or a result of ancestral land mass separations that isolated them from each other. Kind of a reverse isolation I guess in that those colonies not continually strengthened by the nominate form gene pool have evolved into subspecies that differ from the nominate species. Probably as clear as mud, but hopefully at least starts to answer your question. L.

Sanfan, That was an old link that has since been abandoned due to a website update. A link to their home page is provided below. Once you get there, you may want to click on the "Combinations" button towards the top of the page. A dropdown menu for "Spring", "Summer" or "Fall" will appear for you to select from. This should provide you loads of ideas and examples like found below. IronBelly Here is a link that might be useful: Proven Winners

Oohh, loved this. I showed my DH and he immediately went to check it out. Thanks!