Tridens flavus (L.) Hitchc.
Natural range: Canada to Mexico
Habitat: Pine woods, old fields
Florida status: Native. Seasonal: appears in autumn
Recognition: Mid-sized grass having purple paniculate inflorescences. Spikelets 5-10 mm long, laterally flattened with 4-8 florets. Lemmas notched, with a tiny point in the notch. Might be mistaken at a glance for a large Eragrostis except for the notched lemmas.