So-called sour weed

So-called sour weed.

As we were driving to the farm last Friday evening, we passed several fields filled with a pretty red plant. Later, I asked my Mom what it was, and she said it was called sour weed. To which I replied: "Oh, is that what sourwood honey comes from?" Quickly, she quipped: "No, that's sour weed, honey. Not sourwood honey."

The thing is, when I looked up sour weed on the internet, I found all kinds of references to something else. Some of y'all will probably know what I'm referring to. LOL! Anyway, I can't seem to find out what this stuff in the photo is. Could it be red sorrel, perhaps?

If anyone has any ideas, let me know.