Appearance
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.The grass is often confused with the similar looking Johnson grass, although it is only distantly related. "Tridens flavus" is easily distinguished by its short, hairy ligule.
It is a larval host to the common wood nymph, crossline skipper, little glassywing, and the Zabulon skipper.
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