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4a. Petalonyx thurberi A. Gray subsp. thurberi
Plants to 8 dm; branches of current season to 45 cm; hairs on inflorescence-bearing stems stiff, ± retrorse. Leaves to 45 × 15 mm. Flowers: petals to 6.5 mm; stamens 6–10 mm; style 5–11 mm. 2n = 46.
Flowering Mar–Nov. Sandy washes, sand dunes; 10–1600 m; Ariz., Calif., Nev.; Mexico (Baja California, Sonora).
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