1, Viola yedoensis, alias Viola, Viola glabra, etc. Perennial herb, belonging to Paris of Violaceae, has no aboveground stems, is 4- 14 cm high, and its fruiting period can reach more than 20 cm. The lower half of the leaf is triangular oval or narrow oval, and the upper half is oblong, narrow oval, lanceolate or oblong. Medium-sized flowers, violet or lavender, sparse white, pale throat with purple stripes, can be used early.
2. Catharanthus microcarpa, a perennial herb of Catharanthus of Apocynaceae, has erect flower stems and hairless whole plant. Leaves oblong to ovoid; Corolla funnelform, purple or white; Corolla tube longer than calyx, corolla lobes obliquely obovate; Disk ligulate; The end of the style is enlarged, the stigma is hairy, and there is a thickened annular disk at the base. 2 clams, erect;
3. Orychophragmus violaceus is an annual or biennial herb of Orychophragmus in Cruciferae. Because blue-purple flowers begin to bloom around February in the lunar calendar, they are called February Blue. It grows in plains, mountains, roadsides and land edges. Low requirements for soil illumination and other conditions, cold and drought tolerance, strong vitality.