We do not have access to Jäger's archives (if they still exist). I do not think he invented parentages. This one is probably based on some magazine article or nursery catalogue which has not been digitalized yet. Wikipedia has a source for the parentage of its article on 'Marie Baumann' - it is HelpMeFind!
Right, I don't think Jäger simply cooked up things himself, as that would be pointless and ultimately self-defeating; but it's an obligation of the historian to probe when possible the validity of Jäger's source, hence the question.
the comments you make here about marie baumann hp and mme alphonse de lavalee hp is quite correct having seen the two together, they are quite seperate and disticnt rose varieties.Both in colour,fragrance and bloom style and also in bush type they are very different.they could never be mistaken as to be the same plant
