The Poaceae (also called Gramineae or true grasses) are a large and nearly ubiquitous family of monocotyledonous flowering plants. With more than 10,000 domesticated and wild species, the Poaceae represent the fifth-largest, following the Orchidaceae, Asteraceae, Fabaceae, and Rubiaceae. Though commonly called “grasses”, seagrasses, rushes, and sedges fall outside this family.