Back on-line...
Also, with the poekweed some parts are poisonous some are edible for ex. Some needs to be cooked (bracken ex.).
All-in-all, positive identification and know how to prepare some -in my opinion- is better than some hazy knowleddge about all (similarly to knots). So I started looking around in the area and also reading the book before falling asleep (happens soon with such a good book) to identify few but reliable, easily recognizable plants that I feel comfortable with and can distinguish from the toxic look-alike (better if there is none). And let's forget about the rest! Even with the speed of learning one plant a week I could master myself soon (I haven't).
After saying all this I would ideally have a table in my mind with 4-5 plants per season per geographic region and inhabitat (mountain, forest, fields, by water). Again, the more ubiquotus the plant is, the more the categories overlap the better.
As quick check, I look into the book and see few I found easier:
lichens and mosses- Need soaking (cathartic)
puffball- I would skip the other mushrooms
cattail- winner
reed, phragmite, wild rice, grasslikes- seeds fine, be aware of discolored seedlike fungi (lethal)
crabapples, blueberries, cranberries, wax-berry, strawberries- some look-alikes can be toxic
sycamore, mulberries, oaks, beech,birch, elm, hazelnuts, basswood, hickories, walnuts, locust, maples- easy to recognize food
palmetto, yuccas, spanish bayonet- palm and yuccas
juniper, spruces, firs- cool except yew, BTW pinon seeds are delicious!
nettles, chicory, mints, burdocks, thistles, onions (only bulbs I trust), milweed, roses, sunflower, jerusalem artichoke, dandelions, sweetflag, clovers, plantain
prickly pear, pond-lilies
In general I stay from mushrooms, lilies, bulbs, umbrellalike flowers and any questionable berry.
Hope it made sense and look forward to hear from the experts.
Best,
HM
PS: When driving on Route 1 from LA to Frisco I ate a lot of caraway seeds grown along the road. Smell was typical but still, poison hemlock is one of the deadliest ones (all right, you might escape with paralysis). Brave me consumed a handful..and no 'edibility test'. I would not do it again.
BTW, edibility test is good to know.