Vulpia myuros, the annual fescue,[1] or rat's-tail fescue,[2] is an annual flowering plant in grass family Poaceae.
It was probably originally native to Eurasia, but it can now be found nearly worldwide as a naturalized species.
In the United Kingdom it forms dense, even swards of fine, hair-like stems in recently disturbed habitats.
Vulpia myuros is considered a noxious weed and invasive species in places where it is not native, especially in areas with a Mediterranean climate.
[3] For example, it is widespread in California, where it is now a dominant species in many types of grassy habitat.