Oreobolus pumilio, commonly known as alpine tuftrush or Ibrang`rank,[2] is a small mat forming herb which is distributed throughout the Australasian region.

[3] As a cushion plant, it is an ecological engineer and enables other species to grow in the alpine herblands to which it is native to.

[7] Oreobolus pumilio is mat forming herb growing to 8 cm high with blade like leaves.

[9] As Oreobolus pumilio grows in high alpine environments its short growth, like that of all cushion plants, is advantageous.

These communities are considered ecological engineers as they can have an effect on the environment such as the ability to produce a peat like soil.