Baogaicao is an annual or biennial plant of the family Lamiaceae and the genus Fabaceae. Stem height 10-30 centimeters, with multiple branches at the base. The lower leaves of the stem have long stalks, which are equal to or exceed the length of the leaves. The upper leaves have no stalks, and the leaves are all round or kidney shaped. Hibiscus inflorescence with 6-10 flowers, often including flowers that are fertilized by closed flowers; The bracts are needle shaped and diamond shaped. The calyx is tubular and bell shaped, with white elongated soft hairs densely covering the outer surface. The inner surface is hairless except for the white elongated soft hairs on the calyx. The calyx has 5 teeth and is conical in shape. The corolla is purple red or pink, with the outer lip covered in dense purple red short hairs and the rest covered in soft hairs.