Check out the Gesneriad Reference Web...
Roma,
thanks a lot, I did. There I found the name of the
Str. saxorum, with the problematic name "compact". Problematic for that, because my plant (left picture) seems the same, but
not compact. For that, it should be
Str. saxorum "not compact/normal" too.
Another point: The
Str. caulescens on "your" page carries other leaves and smaller flowers, but the pictures by wikimedia (Ibaraki Botanical Garden) are definitely my plant ... so have to decide: Gesneriad Reference or wikimedia/bot. garden wrong.
I am not able to do. Are you able, please, do ... !
Greeting, Rudi