Calamus is also often referred to as stink bushes, water caltrops, white caltrops and so on. With orchids, daffodils, chrysanthemums and known as "flowers and grass four elegant"; is used in our traditional culture to prevent disease and drive away evil spirits of a spiritual grass, symbolizing happiness. People also take it as a god grass, will be April 14 every year as the birthday of calamus. Since ancient times is one of the species of high ornamental value, not only has a long history of ancient culture, in today's still is the ornamental value and medicinal value of high and rich aquatic plants, there are many kinds of its species, there are mainly three kinds, the following small make-up will be introduced to you specific types of iris and efficacy