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Tetragonotheca repanda is known from the Gulf Coastal Plain.

Stems sparsely tomentulose or glabrous. Leaves mostly basal (cauline much smaller); blades rounded-deltate to ovate, 5–12 × 3–7 cm, coarsely toothed. Ray florets 16–21; laminae 20–30+ mm. Cypselae ± quadrate, 4–5.5 mm; pappi of 20–30, obovate to spatulate scales 1–2 mm. 2n = 34.

Halea repanda Buckley, Proc. Acad. Nat. Sci. Philadelphia 13: 458. 1861