9 minutes ago, liuzhou said:We certainly have it in the UK and it grows in North America, although it appears in very limited areas.
Apparently it was used by many indigenous tribes as both a vegetable and the seeds were ground into a flour for breadmaking. That is according to Mr. Google. Have not verified this information. Perhaps some of our foragers will chime in. I am thinking especially of @gfron1
Edited to add:
I am sure I have seen it somewhere in the wild. I’m not sure where.