]> GH barcode-02021657 United States of America Colorado Piedra, 0.6 miles from junction of Lower Piedra camp ground and Hwy. 160, on the camp ground road; and on the bluff of the Piedra River Cirsium pulchellum (Greene ex Rydberg) Wooton & Standley (Greene ex Rydberg) Wooton & Standley 2022-06-03 09:33:13 G. B. Ownbey & Y. Hsi