Sporobolus arcuatus Calamovilfa arcuata, commonly known as Cumberland sandreed,[2] is a species of flowering plant in the grass family.

Due to its specialized habitat, it has a highly localized range, found only on the Cumberland Plateau and in the Ouachita Mountains.

These flood events naturally occur in high-gradient, rocky rivers, which results in the prevention of large tree growth.

[5] Due to its specialized habitat, and low density of populations, Calamovilfa arcuata is considered imperiled.

[6] This species produces flowers in late summer, at the time when the chances of a scouring flood occurring are lessened.