Polygonum
Polygonum (Polygonum) is an annual herb of Polygonaceae. Polygonum leaves are lanceolate, flowers pale or green. Fruit is ovate, flat. Stems and leaves are spicy. Many species, mostly grown in the waterside, what Shouwu, water Polygonum, Polygonum, carry board and so on. The whole plant can be used as medicine, and leaves or stems can be used as a dye to use, but as the indigo dye raw material is really very shallow blue, it is often through different refining techniques to change a variety of dyeing. The generic term of some plants in Polygonaceae. ...