Have you ever come across an example of lily of the valley in the Polish folk style? I've been trying to find a reference for that specific flower, but no such luck yet.
They aren’t popular as a decorative motif, but I’ve seen them in a few occasions, or at least something that looks like a lily of the valley :)
Definitely in wycinanki and embroidery, and I think also in “primitive art” paintings and woodwork (as for the last two, my memory fails at the moment but I’ll try to look for examples later).
Above is an example of them in a wycinanka (this style as far as I know is from Sanniki).
Example on an atique red jacket with what I think are the flowers in question.
Museal example embroidered on a bodice from Łowicz. Need to look for a good closeup!
Two other examples from Łowicz [from Pracownia Stroju Łowickiego]
Example from Kraków [x]
If somebody else remembers other examples, feel free to add!