This is Senna hebecarpa, also known as American senna, Wild Cassia, and Wild Senna. This gorgeous shrub likes to live in the full sun where it gets a lot of attention from the birds, bees, and butterflies. They can get about 6 feet tall at the most and they bloom from the middle of the Summer until early Fall. The pods and leaves of this plant contain powerful laxatives called anthraquinones; For this reason many plant eating animals will not eat this one. This is the only known larval host plant for the Orange-barred Sulphur. It is also the larval host plant for the Mercurial Skipper, Tailed Orange, Cloudless Sulphur and Sleepy Orange butterflies. USDA Hardiness Zones 5 to 9.