Calathea is a genus of flowering plants belonging to the family Marantaceae. They are commonly called calatheas or prayer plants. About 200 species formerly assigned to Calathea are now in the genus Goeppertia. Calathea currently contains around 60 species.
 
Care:
Water every 1-2 weeks, allowing soil to dry out half way down between waterings. Expect to water more often in brighter light and less often in lower light.