Gymnostoma is a genus of flowering plants belonging to the family Casuarinaceae. These trees and shrubs are primarily found in tropical and subtropical regions, particularly in Australia and New Guinea. They are known for their unique needle-like leaves and woody, jointed stems, which resemble those of conifers. The plants in the Gymnostoma genus are often used for reforestation and soil stabilization due to their ability to thrive in poor soils. They also play a role in providing habitat for various wildlife species. Additionally, some species are valued for their timber and are used in traditional medicine.