Podostemaceae is a family of flowering plants commonly known as river weeds. They are primarily aquatic and thrive in fast-flowing freshwater environments, such as rivers and streams. These plants are unique because they often grow attached to rocks or submerged surfaces, rather than floating freely in the water. Members of the Podostemaceae family exhibit a range of morphological adaptations, including flattened stems and reduced leaves, which help them withstand strong currents. This family includes about 50 species, primarily found in tropical and subtropical regions, contributing to the biodiversity of aquatic ecosystems.