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1. Pseudoclappia arenaria Rydberg, J. Wash. Acad. Sci. 13: 289. 1923.
Leaf blades 10–35 mm. Ray florets 2–4+; laminae 5–11 mm. Disc florets 20–40+; corollas 6–7 mm. Cypselae ca. 3 mm; pappi 4–6 mm. 2n = 36.
Flowering spring–summer. Clays or gypseous-sandy soils, probably seeps, springs; 1000–2000 m; N.Mex., Tex.; Mexico (Coahuila).
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