Hello Bart ,
maybe I can help you ...
I grow since many years a Pelargonium ( a gift from a cacti friend ) - he told me it is a Pelargonium species .
Before some weeks I have sent pics of this plant to a german friend - she works on a Institute for plant breeding
They grow there a lot pelargonium ...so she ask the boss what my plant could be ..the quick answer was :
Pelargonium x Friesdorf
Last week I have ask a friend from this Forum if he knows anything about this cross ...
Some times later he send me the answer :
The breeder was Max Löbner vom B.G.Bonn ( 1927 ) - and the area for breeding was called Friesdorf :
http://www.botgart.uni-bonn.de/o_uns/figure/loebner.phpI have tried to look in the plant list of this Botanical Garden ...and there is now listet only :
Pelargonium x zonale "Stadt Bern"
So it seems for me that the plant who former called "Friesdorf" is now "Stadt Bern"
I'm not sure if I'm 100% correct ...
I enclose some pictures from my plant :
Do you have maybe pictures from your plant ?
Hans