Calamovilfa gigantea is a species of grass known by the common name giant sandreed.

It is native to the Rocky Mountains and Great Plains of the United States.

[1] This perennial grass has a long rhizome coated with scalelike leaves.

The inflorescence is a panicle up to 80 centimeters long by 60 wide, with spreading branches.

[2] The Hopi used this plant to make various articles, such as bows and arrows and prayer sticks and to decorate kachinas.