Bixaceae is a family of flowering plants that includes several genera and species, the most well-known of which is probably the genus Bixa, which contains the annatto plant (Bixa orellana). The seeds of this plant are used as a spice, food coloring, and traditional medicine. Bixaceae plants are characterized by their large, showy flowers and woody, often thorny stems. They are primarily found in tropical regions of the Americas.