Lyonia is a genus of flowering plants in the family Ericaceae, commonly known as the heath or heather family. It includes several species of shrubs that are primarily found in the southeastern United States. These plants typically thrive in acidic soils and are often associated with wetlands and sandy habitats. The genus is characterized by its small, bell-shaped flowers and evergreen leaves. Some species, like Lyonia lucida, are known for their ornamental value and are used in landscaping. Lyonia plants also play a role in local ecosystems, providing habitat and food for various wildlife species.