Flora of northern Caucasus

On page
http://mnogoletnik.narod.ru/Fl_SK/Fl_SK_STUVWXZ.html

plants that are found growing in northern Caucasus are listed.

Among other there is quite a number of "exotic Sempervivum species" - here's a complete list:

Sempervivum
— altum
— borissovae
— caucasicum
— ingwersenii
— ossetiense
— pumilum
— borysthenicus
— buschianus
— calvertii
— caucasigenus
— cladobotrys
— erraticus
— erucifolius
— fulvius
— grandidentatus
— jacobaea
— karjaginii
— kolenatianus
— lapsanoides
— macrophyllus
— noeanus
— othonnae
— pandurifolius
— platyphylloides
— pojarkovae
— propinquus
— racemosus
— rhombifolius
— schischkinianus
— sosnovskyi
— subfloccosus
— taraxacifolius
— vernalis
— visoosus
— vulgaris

I will try to find more about those names, but any help is welcome!