[jkh1]

Of course there are more than that. Look at any comprehensive guide book on edible/foreageable plants and you'll definitely find more than a couple hundreds. For example, the plants for a future database (https://pfaf.org/user/Default.aspx) lists thousands of edible plants that grow in temperate climates. Many plants are edible if only for some parts and many are not particularly tasty and/or need some preparation.

Edit: To answer the question of the composition, the dominant taste comes from Tanacetum balsamita (https://en.wikipedia.org/wiki/Tanacetum_balsamita).