Sesbania drummondii, known as poisonbean, rattlebox and rattlebush, is a medium-sized perennial shrub in the legume family Fabaceae. It is native to the southeastern United States, from Texas east to Florida.
The orange-yellow, pea-like flowers occur in a drooping raceme on a long stem. They are often found with red lining. The seed pods are four-sided, four-winged, and about 10 centimetres (3.9 in) long. The peas rattle inside, giving this plant its common name of Rattlebush. Inside the pods, the seeds are separated by transverse partitions.
The seeds are poisonous, containing the toxin sesbanimide.
