1. Imperata cogongrass root is the root of the plant Imperata cogongrass, which has medicinal value.

2. The rhizome is long cylindrical, sometimes branched, of varying lengths, 2-4mm in diameter. The surface is yellow-white or light yellow, shiny, with longitudinal wrinkles, and obvious links. Gray-brown scale leaves and fine roots remain on the nodes, and the length of the internode is 1-3cm. The body is light and tough, and the broken surface is fibrous, yellowish white, with many radial cracks, and sometimes a small hole can be seen in the center. The smell is slight and the taste is slightly sweet. The ones with thick strips, white color and sweet taste are better.