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Tridens flavus
Also called Purpletop, Redtop, Greasegrass, Greasy Grass, Tall Redtop
Tridens flavus, known as purpletop, purpletop tridens, tall redtop, greasy grass, and grease grass, is a large, robust perennial bunchgrass.
The seeds are purple, giving the grass its common name. The seeds are also oily, leading to its other common name, "grease grass". It reproduces by seed and tillers.
Text excerpted from the Wikipedia article Tridens flavus by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
