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 holds shiny tan spikelets which are sometimes tinted with purple, each about half a centimetre long.

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.

[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.