Cenchrus echinatus
 Cenchrus echinatus is a species of grass known by the common names southern sandspur southern sandbur and in Australia Mossman River grass. It is native to North and South America.It is a clump-forming annual grass growing up to 80 cm tall. The leaves occur with or without hairs and measure up to 12 mm wide. The ligule is a fringe of hairs. The grass has barbed burrs up 4–10 mm long.In Australia it forms an invasive weed in coastal situations.