That's a good mix, John and several of them I cover in the book in detail: mallows, good king henry, black salsify, artichoke, asparagus and horseradish, all for greens, although for me the taste of raw Good King Henry has earned it the name Bad King Henry in my book!!
You ask for one unusual self-seeding raw edible perennial....have you tried Hablitzia tamnoides, a perennial self-seeding climbing plant that I introduced in this article in
Permaculture Magazine in 2007:
http://emmacooper.org/files/hablitzia.pdf
Again, the story is updated and covered in depth in the book.... I actually harvested a few spring shoots from under the snow yesterday, one of the earliest greens available!
I know Alan Kapuler (Peace Seeds) just south of you grows it (I sent him seed a few years back) and was the first to offer seed in North America. This year, Fedco Seeds are also offering seed!
Hablitzia shoots can be eaten raw in spring and older leaves are great cooked later in the season!
I plan to be in Oregon towards the end of August in the area Portalnd to Eugene and hope also to get up into the mountains for some inspirational foraging. Maybe see you then!!