Rattlesnake Master

Eryngium yuccifolium 
 
 
 
A striking member of the Parsley family, and resembling the succulent Yucca plant, this unusual species produces thick, bluish/green fleshy leaves with spines along the edges. The bloom is also unusual in that it is spherical and also bluish/white in colour. Provides a nice accent in the prairie garden. Drought tolerant. A native of the U.S. midwest.