Koeleria macrantha is a species of grass known by the common name prairie Junegrass in North America and crested hair-grass in the UK.

Koeleria macrantha is a short, tuft-forming perennial bunchgrass, reaching heights from 20–70 centimetres (8–27+1⁄2 inches).

It is one of many dietary staples for all classes of livestock and several species of various prairie wildlife depending on the stage of its seasonal development.

It provides a stable source of nourishment for livestock in early spring and has been utilized by several species of deer, elk, and sheep as a food source due to its ability to grow in remote areas where the environment is not suited for other plant life.

[9] The seed can be ground into a powder, which can then be boiled in water like a porridge or made into flour or bread.

[2] Koeleria macrantha has been implemented in several areas of frequent wildfires due to its fire-resistant qualities.

Although this species varies in its impact on fighting wildfires depending on the environment it grows in and the state of the plant, it provides a much needed damper for controlling the fire once it has begun.