Osbornia

Osbornia is a genus of flowering plants in the family Lamiaceae. It is a monotypic genus, meaning it contains only one species, Osbornia octodonta.

Osbornia octodonta, commonly known as mangrove tea, is a shrub or small tree found in mangrove swamps and coastal areas of Southeast Asia, Australia, and the Pacific Islands. It is characterized by its opposite, simple leaves and small, white, tubular flowers that occur in clusters. The flowers typically have eight teeth on the calyx (octodonta means "eight-toothed"), which is a distinguishing feature of the species.

The plant plays a role in mangrove ecosystems, providing habitat for various organisms and contributing to shoreline stabilization. It is typically a pioneering species, capable of colonizing disturbed areas. Its leaves and other parts of the plant have been used traditionally for medicinal purposes in some regions, although scientific research on its medicinal properties is limited.