Sorry for getting here so late. : )
beard of Jupiter, I notice they don't make the b (from beard) upper case, is that correct? Not to be confused with Jupiter's Beard (Centranthus ruber).
On Sempervivum, Houseleeks or Live Forever is used much of the time. Hen and chicks (chicks not upper case) is associated with many other plants including sempervivum. I am not really sure which is correct.
Would be great if we could have all three of those common names. But I guess that would not look good in the semp listings.
Not at home right now, but will be in about 2 hours.