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3. Tetragonotheca texana A. Gray & Engelmann, Proc. Amer. Acad. Arts. 1: 48. 1847.
Stems sparsely tomentulose or glabrous (nodes usually auriculate-appendaged). Leaves mostly cauline; blades ovate to lanceolate in outline, 3–7 × 1–3 cm, subentire to incised or irregularly pinnatifid. Ray florets 8–13; laminae 10–18 mm. Cypselae ± quadrate, 2.5–4 mm; pappi 0, or (often fragile) of 1–10+ subulate or acerose scales to 0.5(–1.5) mm. 2n = 34.
Flowering spring–summer. Sandy soils, often with mesquite; 50–200 m; Tex.; Mexico (Coahuila, Nuevo León, Tamaulipas).
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