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Eryngium

1. Leaves all netted-veined, of various shape (basal petioled with broad subcordate blades, upper and midcauline nearly sessile and lobed); bracts more than half as long as the head; petals blue; escapes from cultivation.

E. planum

1. Leaves all parallel-veined, simple and elongate (yucca-like); bracts subtending heads less than half their length; petals white; rare native species.

E. yuccifolium

All species found in Eryngium

Eryngium planumERYNGO 
Eryngium yuccifoliumRATTLESNAKE-MASTER 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 25, 2017. http://michiganflora.net/genus.aspx?id=Eryngium.