Paspalum vaginatum is a species of grass known by many names, including seashore paspalum, biscuit grass, saltwater couch, silt grass, and swamp couch in the English language, grama de costa, grama de mar, gramilla blanca, and gramón in Spanish, herbe rampante in French, and hai que bai (Chinese: 海雀稗; pinyin: hăiquèbài) in Chinese. It is native to the Americas, where it grows in tropical and subtropical regions. It is found throughout the other tropical areas of the world, where it is an introduced species and sometimes an invasive weed. It is also cultivated as a turfgrass in many places.