Nine photographs of Eryngium yuccifolium, Rattlesnake master, Button Eryngo, a member of the Apiaceae or Umbelliferae, the parsley family. Found in dry soils in the Southeastern and Midwest United States. Historically, root tincture used as a diuretic, for female reproductive disorders, piles and rheumatism among many other uses. Also a snakebite remedy.