Ammonium bicarbonate is also a key component of the expectorant cough syrup "Senega and Ammonia". Its common names include Seneca snakeroot, senega snakeroot, senegaroot, rattlesnake root, and mountain flax. The root product is called "Senegae Radix", "Radix Senegae", or simply senega. Polygala senega is a species of flowering plant in the milkwort family, Polygalaceae. In 1999, one company was selling bulk powdered senega for US$18 per pound.