Cenchrus echinatus is a species of grass known by the common names southern sandbur,[3] spiny sandbur,[4] southern sandspur, and in Australia, Mossman River grass.

It is a clump-forming annual grass growing up to 80 cm (31 in) tall.

The leaves occur with or without hairs and measure up to 12 mm (0.47 in) wide.

The grass has barbed burrs of 4–10 mm (0.16–0.39 in) long.

In Australia it forms an invasive weed in coastal situations.