Corydalis tricolor, a biennial or perennial herb of Viola in Violaceae. The stems of Corydalis tricolor are thicker on the ground; The leaves are ovate or lanceolate, with longer petioles in the upper part and shorter petioles in the lower part; Pansy flowers are relatively large, usually each flower has purple, white and Huang San colors; The fruit is oval; Flowering from April to July; The fruiting period is from May to August. Because the flowers of pansy are very distinctive, each flower has three different colors: yellow, purple and white, so it is named "pansy".

Corydalis tricolor is a common wild flower species in Europe, which is native to northern Europe and widely planted in northern and southern China. Corydalis tricolor is cold-resistant, likes cool and sunshine, avoids high temperature and stagnant water, and is cold-resistant and frost-resistant; It is suitable to plant neutral loam or clay loam rich in organic matter because it is fertile and well drained. Generally, pansy adopts the methods of cutting propagation and ramet propagation.

The whole plant of Corydalis tricolor has medicinal value. According to Compendium of Materia Medica, Corydalis tricolor has the effects of clearing away heat and toxic materials, removing blood stasis, relieving cough and diuresis. Corydalis tricolor is rich in vitamins, and its flowers are fragrant. It can extract essence and has certain economic value. Pansy is an ornamental flower. In cities, pansy is one of the main flowers for arranging flower beds in spring. In parks, roads and communities, pansy with cat face is the most common one.