Let's call the whole thing Hens and Chicks!
Sempervivum (translated Live Forever) is a remarkable little succulent plant. There are literally hundreds of cultivars due to it's ease of seeding and the way it cross pollinates with others of it's own specie.
It is often referred to as Hens and Chicks because of the way it usually has one center Hen surrounded by many smaller Chicks. But don't be mislead ~ this is one tough little mother! It can survive cold, hot, wind, dry... almost any miserable condition. The one thing it does not like is to be soggy.