2. Pine willow vegetable, also known as acacia vegetable and pine willow seedling, is a high-grade vegetable just introduced from abroad and originated in South America. In China, it is mainly produced in Inner Mongolia, Shaanxi and Gansu. The seeds are light yellow and look like corn kernels. Many people think it's corn, more like a horse's tooth. Some places are called horsetooth beans, because they look like diamonds, and the origin of Inner Mongolia is called Mitsubishi peas.