Cathy,
Purslane actually is a wild plant, that grows like a weed all over the south. It's almost as ubiquitous as chickweed.
There are a number of guides to edible wild plants. See, for instance, any of Eull (?) Gibbons' books (such as Stalking The Wild Aspargus). There is also at least one card deck you can carry around that identifies edible wildings.
I'm sure if you do a search under edible wild plants a lot will show up.
I would love to do that sort of foraging. Unfortunately I just don't have the time for it. So, other than a trip or two in the spring, for fernheads and mushrooms, I have to forego it.
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