The Encyclopaedia Of Healing Foods by Dr Michael Murray and Dr Joseph Pizzorno.

Not strictly foraging or wild plant related but does contain a lot of useful information about nutritional and medicinal properties which are applicable.

There are a few vegetables listed which are wild plants, such as Dandelion, various seaweeds and horseradish.

I’m keen to add their previous publishing, Encyclopaedia Of Natural Medicine to my collection.