Eryngium yuccifolium, known as rattlesnake master, button eryngo, and button snake-root, is a perennial herb of the parsley family native to the tallgrass prairies of central and eastern North America. It grows from Minnesota east to Ohio and south to Texas and Florida, including a few spots in Connecticut, New Jersey, Maryland, and Delaware.
The common name 'rattlesnake master' comes from the fact that some Native Americans used its root as an antidote for rattlesnake venom. The species name yuccifolium ...