Sicklepod, or Senna obtusifolia. A weed, and one that is poisonous to animals.

We called it coffeeweed when I was a kid. Douglas is correct that it's harmful to animals that eat it.

We call it coffeeweed also on our farm. Many years ago my son was little and was riding on the farm with my Daddy in his truck. My son wanted to drive and Daddy told him not right now, my son was riding in the back of the truck. My Daddy looked in his mirror and my son was sticking his tongue out at him. Daddy stopped the truck, got out and got a coffeeweed and put an old fashion "whipping" on him. My son will tell you to this day, he has never stuck his tongue out again at anyone. I think of this story everytime I hear or see coffeeweeds.

love the shape of the leaves.