Two alternative names for this rose are, "Rosa alba flore simplici" and "Single White Rose", yet all the photographs and paintings show a semi-double rose.

I posted this already under 'Eurydice' but it's accurate here as well.
It seems in Europe (some?) Aennchen von Tharau is identical to (some?) Eurydice. And comparing the references, i must say I cannot decide wich is wich, especially when Eurydice is generally considered to be a mislabelled Jean Lafitte.
If anyone ever noticed this or would have further opinion please do contribute!