Looking at that link, I see that what I call pig weed and assumed to be that same as lambs quarters, isn't. What I eat is lambs quarters, not the plant that is shown in the picture in that link.It IS poisonous to some livestock. http://www.ansci.cornell.edu/plants/php ;keynum=12 I didn't know it was edible, but don't know that I'd want to eat the one we have growing around here-it's spiny pig weed, and has a bunch of thorns on it.