rattlesnake weed

noun

1. a hawkweed, Hieracium venosum, of eastern North America, whose leaves and root are thought to possess medicinal properties.
2. a carrotlike weed, Daucus pusillus, of southern and western North America.
3. any of certain other plants, as an umbelliferous plant, Eryngium aquaticum.
4. rattlesnake plantain.