牛筋草（学名：Eleusine indica），禾本科椮属。俗名：蟋蟀草、牛顿草、牛信棕。开花期为全年。繁殖器官是种子。

牛筋草的特征是它韧如牛筋的茎及其根系发达，且为深根系因此拔除不易。小穗椭圆，颖果卵形，深褐色。一年生禾草，秆丛生，叶鞘两侧扁平。叶线形，平滑无毛，叶舌短。

Eleusine indica, the Indian goosegrass, yard-grass, goosegrass, wiregrass, or crowfootgrass, is a species of grass in the family Poaceae. It is a small annual grass distributed throughout the warmer areas of the world to about 50 degrees latitude. It is an invasive species in some areas.