Pharmacopoeia under the name "black snakeroot". These signs often appear several hours after ingestion of white snakeroot. Some professionals believe it to be caused by the addition of poisonous button snakeroot. Cows often roamed in woods and underbrush, where the white snakeroot grew. Litrisa is a genus of flowering plants in the snakeroot tribe within the daisy family. "Rauvolfia serpentina", commonly known as or Indian snakeroot or "sarpagandha", contains many indole alkaloids. Experiments on a calf confirmed the toxic effect of Snakeroot. Bixby discovered that white snakeroot ("Ageratina altissima") contains a toxin. Its common names include Seneca snakeroot, senega snakeroot, senegaroot, rattlesnake root, and mountain flax. The distillate from the ground root is known as Canadian snakeroot oil. The common names usually include the terms sanicle or black snakeroot. Another flowering plant found around the lake is White Snakeroot ("ageratina altissima"). Other common names include snakeroot, snake-root, snakeweed and Easter-ledges.