| Tridens flavus | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Monocots |
| (unranked): | Commelinids |
| Order: | Poales |
| Family: | Poaceae |
| Genus: | Tridens |
| Species: | T. flavus |
| Binomial name | |
| Tridens flavus (L.) A.S.Hitchc. |
|
Tridens flavus (Purpletop, Red Top, or Greasegrass) is a large, robust perennial bunchgrass native to North America. The seeds are purple, giving the grass its common name. The seeds are also oily, leading to its other common name, "greasegrass". It reproduces by seed and tillers. The grass is often confused with Johnson grass.