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1. Tetragonotheca ludoviciana (Torrey & A. Gray) A. Gray ex E. Hall, Pl. Tex. 13. 1873.
Halea ludoviciana Torrey & A. Gray, Fl. N. Amer. 2: 304. 1842
Stems sparsely tomentulose or glabrous. Leaves mostly cauline (distal connate-perfoliate); blades rounded-deltate to ovate, 8–12 × 4–9 cm, coarsely toothed. Ray florets 12–13; laminae 8–18 mm. Cypselae ± quadrate, 4–6 mm; pappi of 16–30, obovate to spatulate scales 0.5–2 mm. 2n = 34.
Flowering late spring–summer. Deep sandy soils with scrub oaks; 10–100 m; La., Tex.
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