Bai Tou Weng or Pulsatilla is a plant with an interesting flower which features fine white hairs. It's also called Pasque flower or meadow anemone. There are many species grown throughout the world, but this particular product is Pulsatilla Chinensis. Its active ingredient is anemone, which is a odourless crystalline. This product includes the root only, which is yellowish brown to dark brown in colour.