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1b. Amphipappus fremontii Torrey & A. Gray var. spinosus (A. Nelson) Ced. Porter, Amer. J. Bot. 30: 483. 1943.
Amphiachyris fremontii (Torrey & A. Gray) A. Gray var. spinosa A. Nelson, Bot. Gaz. 47: 431. 1909; Amphipappus spinosus A. Nelson; A. fremontii subsp. spinosus (A. Nelson) D. D. Keck
Young twigs, peduncles, and leaves densely hirtellous.
Flowering Mar–May. Rocky or sandy soils, flats, washes, slopes, rock outcrops, canyon walls, cliff faces, commonly with Larrea, Yucca, Ambrosia; 500–1300 m; Ariz., Calif., Nev., Utah.
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