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1. Guardiola platyphylla A. Gray, Smithsonian Contr. Knowl. 5(6): 91. 1853.
Leaf blades coriaceous, 20–70 × 15–50 mm. Phyllaries 7–10 mm. Ray laminae 3–5(–7) mm. Disc corollas 9–11 mm. Cypselae 5–6 mm. 2n = 24.
Flowering spring–late summer. Hillsides, canyons, among rocks; 800–1600 m; Ariz.; Mexico (Chihuahua, Sonora).
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