Viper's grass is also known as adder's tongue, snake's herb, serpentaria, and serpentwort. These synonyms come from the historic use of the plant in treating snake bites, as it was believed to draw out venom. In addition to these names, it is also sometimes called meadow sweet, as it is often found in meadows and wetlands. Viper's grass contains a compound called coumarin, which gives it a sweet, vanilla-like fragrance and has been used in perfumes. Despite its association with snakes, this plant is harmless and actually provides an important food source for insects and wildlife.