Edible Wild Plants
On edible plants, fungi and other foragable growths.
Botany in a Day: The Patterns Method of Plant IdentificationFood for Free
Botany in a Day: The Patterns Method of Pla...
by Thomas J Elpel
£14.30
A lot of information on edibility of plants, not detailed enough though. Tailored for America, but much can be transfered to E...
Food for Free
by Richard Mabey

Doesn't cover every available food plant, but covers many of the most important ones very much in detail. Excellent book.