On our visit to see the petroglyphs, we ran into this very interesting plant. It shakes like a rattlesnake when you kick it, and there are pretty yellow flowers that grow on it. After reading about it, I learned that the plant is Crotalaria and is commonly known as Rattlepods! Most of it is in Africa, and it’s believed that it originated in India, but it’s naturalized on several of the Hawaiian islands.
— HG Kornberg