What does "rattlesnake's master" mean?

coarse prickly perennial eryngo of United States thought to cure rattlesnake bite

What is a synonym for "rattlesnake's master"?

Common synonyms include: button snakeroot, eryngium yuccifolium, rattlesnake master.

Rare ·Advanced level

Noun

1
coarse prickly perennial eryngo of United States thought to cure rattlesnake bite wordnet