Forum Flora Germanica

2 and 3 here, in house, likely limited or no pollinators (maybe flowers touching each other), for decades, 3 not flowering(likely) or gone, I don't know.
1 single flower of img. 1 suddenly appeared. Any comment to how that happened ?
http://agrozoo.net/gallery/Streptocarpus

BTW: if 1-3 can be det. to species ?