Aristida rhizomophora is a species of grass known by the common name Florida threeawn.

[1][2] This perennial grass grows from a thick, scaly rhizome.

The blades are flat or folded, hairless, and light green to yellowish.

The panicle-shaped inflorescence is narrow, with branches appressed to ascending.

[2] It may be found in the ecotone between flatwoods and wet prairie habitat.