It's almost certainly some kind of senna, but I don't have any photos of the mature plant. I collected the seeds here on the property where it grows in the riverbed (only in the riverbed - not in the bottomland) in relatively dry years. It behaves as an annual reaching up to about 8'. Blooms are yellow. Sort of an interesting plant, so I collected some of the beans and here's a couple sprouting now. They are really GREEN! The dry bean was sort of a smutty brown, but these sprouts may be the greenest seedlings I've ever had come out of a seed. They are almost flourescent. I hope next year to get real photos of the mature plant and find it's true identity. I think it's probably a bad plant for the cattle should they ever decide to eat any. It's here naturally and so far as I know they have never bothered with it.
