1. Morphological characteristics: Hedyotis diffusa is usually broomcorn millet, with erect stems, 60 cm high, opposite leaves, oval or oblong, and serrated edges. Flowers are small and yellow, and usually bloom in summer. Herba Siegesbeckiae is a perennial herb with erect stems and an altitude of 1 m. Its leaves are opposite, oval or broadly oval, with serrated edges. Flowers are small and yellow, and open in summer.
2. Distribution area: Hedyotis diffusa is mainly distributed in East China, Central China, South China, Southwest China, Japan and Korean Peninsula. Herba Siegesbeckiae is mainly distributed in South China and Southwest China, as well as in Japan and Vietnam.
3. Uses: Hedyotis diffusa in traditional medicine, the whole herb of Hedyotis diffusa as a medicinal material has the functions of clearing away heat and toxic materials, diuresis and detumescence. Herba Siegesbeckiae is also used as a medicinal material in traditional medicine, which has the functions of clearing away heat and toxic materials, expelling wind and removing dampness, and strengthening bones and muscles.