Another wonderful article, always fun to read. I just wish I could read them all right away, but alas duty calls all too often. I will get this PhD done whether I like it or not, without neglecting my son.
As you noted in another discussion, there are different types of sorrel. There is Oxalis, which is the one that has 3 leaves and looks similar to a clover, and there is Rumex, which has the larger single leaves. And of course, each of these has a bunch of species and cultivars within them. I think Oxalis is edible, and there is a garden sorrel, as well, if I remember correctly, but I have not grown either one for eating, so I can't be sure. You might find it interesting, however, that Rumex has a 3 sided seed just like buckwheat, and is in the buckwheat or polygonum family.