Annual herb, 5 ~ 30 cm high; Stems usually branch from the base, slender. Spoon-shaped, elliptic or lanceolate leaflets alternate, with narrow base and flat and rough hairs on both sides. Spiral cymes, blue corolla, and the top of the inflorescence is spiral. 4 small tetrahedral nuts. The flowering period is May-June.
It is distributed in temperate Asia, Eastern Europe and Chinese mainland, such as Tibet, Inner Mongolia, Xinjiang, Jiangxi, Fujian, Yunnan, Northeast China, Gansu and Guangxi. It grows in areas from 230 meters to 4500 meters above sea level, mostly in hilly grasslands, plains, fields, forest margins or wasteland. At present, it has not been artificially introduced and cultivated.