Thank you all for the great comments. There is still not 100 % consensus but I think it´s ok too say most of you feel it´s necessary to write something on the label if the plant is selfed.
The absence of any rules does´t mean that everybody can and should do what ever he want. For me it seems to be absolutely necessary to find a consent in how to label our plants.The onliest way too avoiding a disaster.
I absolutely agree with Ordovic: "In any case I believe that when it comes to plant labels the more information (provenance, origin, pedigree etc.) the better provided it is clear, concise and accurate.
Are there any further meanings or hints?
Alexander
PS: For me there is a Stone County in Alabama.