Lambsquarter
This European relative of spinach
and beets, which grows
throughout the North America,
bears large quantities of edible,
spinach-flavored leaves you can
collect from mid-spring to late fall.
It's one of the best sources of
beta-carotene, calcium,
potassium, and iron in the world;
also a great source of trace
minerals, B-complex vitamins,
vitamin C, and fiber.
Purslane
Purslane contains more Omega-3 fatty
acids (alpha-linolenic acid in particular) than
any other leafy vegetable plant.
Although purslane is considered a weed in
the United States, it can be eaten as a leaf
vegetable. It has a slightly sour and salty
taste and is eaten throughout much of
Europe, Asia and Mexico.  The stems,
leaves and flower buds are all good to eat.
Purslane can be used fresh as a salad, stir-
fried, or cooked like spinach, and because
of its mucilaginous quality it is also suitable
for soups and stews.