1. Purple alfalfa, also known as clover, grass head and alfalfa, belongs to Leguminosae and alfalfa. Perennial herb, much branched, 30- 100 cm high. Leaves with 3 leaflets; Leaflets obovate or oblanceolate, 1-2 cm long and 0.5 cm wide, with rounded apex, slightly protruding middle rib, serrated upper leaf margin and white villous on both sides; Petiole is about 1 mm, hairy; Stipules lanceolate, apex pointed, pilose, about 5 mm long. Racemes axillary; Calyx pilose, calyx teeth narrowly lanceolate, acute; Corolla purple, longer than calyx. The pod is spiral, with sparse hairs, a beak at the apex and several seeds; Seeds kidney-shaped, yellow-brown.

2. Native to Turkey, Armenia, Iran, Azerbaijan and other places. Widely cultivated in Eurasia and other countries in the world. All parts of China are cultivated or semi-wild. Born in fields, roadsides, wilderness, grasslands, river banks and valleys.

3. Purple alfalfa has medicinal value and contains many effective components, which can reduce cholesterol and blood lipid content, eliminate atherosclerotic plaque, and save immunity, antioxidation and anti-aging; You can also make pasture. At the same time, it also has edible value and ecological value, and has strong regeneration ability. It is actually an excellent soil and water conservation plant in mountainous areas.