All Species in Aristida
- Arizona Threeawn (Aristida arizonica)
- Arrowfeather Threeawn (Aristida palustris)
- Arrowfeather Threeawn (Aristida purpurascens)
- Beyrich Threeawn (Aristida beyrichiana)
- Bottlebrush Threeawn (Aristida spiciformis)
- California Threeawn (Aristida californica)
- Chase's Threeawn (Aristida chaseae)
- Churchmouse Threeawn (Aristida dichotoma)
- Corkscrew Threeawn (Aristida gyrans)
- Curly Threeawn (Aristida desmantha)
- Florida Threeawn (Aristida rhizomophora)
- Forked Threeawn (Aristida basiramea)
- Gypsum Threeawn (Aristida gypsophila)
- Havard's Threeawn (Aristida havardii)
- Islandthicket Threeawn (Aristida refracta)
- Key West Threeawn (Aristida floridana)
- Mohr's Threeawn (Aristida mohrii)
- Pelos Del Diablo (Aristida portoricensis)
- Piedmont Threeawn (Aristida condensata)
- Pineland Threeawn (Aristida stricta)
- Poverty Threeawn (Aristida divaricata)
- Prairie Threeawn (Aristida oligantha)
- Purple Threeawn (Aristida purpurea)
- S-Curve Threeawn (Aristida ramosissima)
- Seaside Threeawn (Aristida tuberculosa)
- Single Threeawn (Aristida schiedeana)
- Sixweeks Threeawn (Aristida adscensionis)
- Slimspike Threeawn (Aristida longespica)
- Southern Threeawn (Aristida simpliciflora)
- Spidergrass (Aristida ternipes)
- Tall Threeawn (Aristida patula)
- Woollysheath Threeawn (Aristida lanosa)
- Wooton's Threeawn (Aristida pansa)