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.