Senna marilandica

Senna marilandica, known as Maryland wild senna or American senna, is a tall perennial herbaceous legume native to the eastern United States, occurring in moist meadows, stream banks, and woodland borders. It grows to 1–2 meters tall with large pinnately compound leaves bearing 4–10 pairs of oblong leaflets, and produces showy yellow flowers in axillary clusters from midsummer. The leaves and pods were historically used medicinally as a laxative, and the plant provides important habitat for specialized bee species.