Eclipta prostrata (scientific name: Yerbadetajo Herb) is the whole plant of the chrysanths intestines of the Compositae plant. When rubbing its stems and leaves, black sap can be seen flowing out, so it is also called "Eclipta prostrata". The synonym is also called Jinling grass. Alternanthera. Eclipta prostrata contains volatile oil, tannins, saponins, Eclipta prostrata, vitamin A and other chemical components.
Annual herb, 10~60cm high. The whole plant is covered with white powdery hairs, and the sap flowing out after being broken becomes blue-black within a few minutes. Flowering from July to September, fruiting from September to October. Born on the roadside, wetland, ditch or field. Distributed throughout the country.