Hedosyne is a genus of plants in the sunflower family. There is only one known species, Hedosyne ambrosiifolia, native to the southwestern United States and northern Mexico: Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Sonora, Zacatecas, New Mexico, western Texas, southern Arizona. The species is sometimes referred to by the common name ragged marsh-elder.