Corydalis, a grayish green panicum miliaceum, has a foul smell. 20-60 cm tall. Flowers are yellow to light yellow, thick and spreading. Produced in most areas of China, it grows in corners, crevices, gullies and grasslands.

From April to July every year, pansy blooms the most. There are many varieties of pansy, so there are many special colors, such as white, yellow, purple and red. It is called pansy by the world because its single flower basically consists of three colors, and there are few solid colors or two colors. Corydalis tricolor is as high as 40 cm, the stem is elongated and exposed to the ground, and the leaves are flat and alternate; Basal leaves ovate or lanceolate, with long stalks; Cauline leaves are ovate, oblong-ovate or oblong-lanceolate, with alternate leaves. Flowers are solitary in leaf axils, with a diameter of 3.5-6 cm, and the colors are purple, red, blue, pink, yellow, white and bicolor. The capsule is oval and hairless.

Originated in Europe, it is cultivated all over China. Cold-tolerant and cool-loving, it develops well under the conditions of daily temperature 15-25℃ and night temperature 3-5℃. It is a common wild flower in Europe and a common gardening plant. Has the effects of clearing away heat and toxic materials and relieving cough. Commonly used for sores, eczema, scrofula and cough in children.