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Comment: gave photo credits to John Gaskin.

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A paper about this species should be coming out soon (Gaskin et al. Carduus cinereus (Asteraceae) – New to North America, in press). 

inflorescence with stem and rootInfested hillsidethistle leaf on person's leg, showing size and spiny leaf edges.Erect plant stem and leaves showing spines.Triple purple and white inflorescences and scale-like bracts.

These images are courtesy of John Gaskin, USDA-ARS.