Cassia seed is the ripe seed of the annual plant Cassia obtusifolia Linn., or Cassia tora Linn., of the Leguminosae/Fabaceae family. The plant is native to the tropics.It grows wild in America, Asia, Africa, and Oceania, and is considered a particularly serious in many places. This is an upright plant with compound leaves in groupings of six. Bears 20-cm pods which contain many cylindrical seeds. In addition to being used as medicinal herbs, the seeds are also used as a mordant in dyeing. They can also be roasted and ground, used as a coffee substitute.