Lotus root, also known as lotus root, belongs to the rhizome of lotus plants, which can be eaten or used medicinally. Jiangsu, Zhejiang, Hubei, Shandong, Henan, Hebei, Guangdong and other places have been planted.

Lotus root is a kind of lotus plant. Lotus root is slightly sweet and crisp, and can be eaten raw or cooked. It is one of the common dishes. Lotus root is also a kind of plant with high medicinal value. Its roots, leaves, flowers and fruits are all treasures, which can be nourishing and used as medicine. Lotus root powder can help digestion, stop diarrhea, stimulate appetite, clear away heat, nourish and prevent internal bleeding. It is a good liquid food and tonic for women, children and patients. Lotus root is rich in vitamin C and minerals, and it is effective, beneficial to the heart, promoting metabolism and preventing rough skin. It is planted in Jiangsu, Anhui, Hubei, Shandong, Henan, Hebei and other places in China. Lotus root, also known as lotus root, is also known as white stem because its underground stem is white. Chen Zhisui's poem "Ode to the Lotus" in Shi Jing, south of the Yangtze River: "Nobody knows that the white stems are buried in the ground. Life is red, green and clear, don't wait for the wind to fill the pool. " Lotus root is also an important agricultural cash crop in the planting area. Lotus root is a plant of Nymphaeaceae.

Oncomelania generally refers to molluscs of Oncomelania, belonging to Gastropoda Oncomelania. River snails are distributed in most areas of China. Snails require higher water quality and produce less. You can catch it in summer and autumn. China snails are very common in fresh water. Snails are dioecious. The method of sex identification of snails is mainly based on the shape of their right antenna. The right antenna of the male snail bends inward to the right (the bent part is the male genitalia). In addition, the female snail is big and round, and the male snail is small and long. Oncomelania hupehensis is an oviparous animal, and its reproduction mode is unique. The embryonic development and larval development of Oncomelania hupensis are completed in the mother body. It takes about a year for a fertilized egg to give birth to a small snail. Oncomelania hupensis lays eggs in batches and begins to breed in March-April every year. At the same time of producing young snails, the male and female parents mate and fertilize, and at the same time, the young snails to be produced in the next year are propagated in the mother. A mother snail can produce about 100 ~ 150 young snails every year.