Begonia species/ hybrids- Warsaw

Bigonia for ID-PC-28.07.2015-03-Warsaw : 4 posts by 3 authors. Attachments (4)
Please identify the Begonia species in the picture. The snaps taken from the residence I am staying here.
begonia cultivated, from the Group or the Tuberosa. quite a popular and easy to keep plant, in red, yellow and various shades.
the redones are Feuersalbei, Salvie (Salvia splendens)