Capsella is a genus of flowering plants in the family Brassicaceae, commonly known as the mustard family. It includes species like Capsella bursa-pastoris, also known as shepherd's purse, which is recognized for its heart-shaped seed pods. These plants are typically found in temperate regions and are often considered weeds in agricultural settings. The genus is notable for its small size and rapid life cycle, making it a popular subject for scientific research, particularly in genetics and evolutionary biology. Capsella species are often studied for their adaptability and resilience in various environments, contributing to our understanding of plant evolution and ecology.