Four new species of Selaginella from Bolivia are described and illustrated: S. alampeta, a species from humid montane forests at 1200–1700 m that is most similar to S. flexuosa; S. arroyoana, a presumably poikilohydric species found on the walls of periodically dry stream beds and in fissures among rocks on Precambrian sandstone massifs at 750–900 m in eastern Bolivia; S. bryophila, an epiphytic species known only from the type collection made among mats of liverworts in humid montane rain forest, and S. chiquitana, from semideciduous forests at 800 m on a Precambrian sandstone massif in southeastern Bolivia.