Chongqing, with its rich natural resources both on the ground and underground. There are rich plant resources in the territory of Chongqing, with a forest coverage of 20.49 percent. More than 6,000 kinds of various plants can be found in this area, including rare species of trees, such as the spinulose tree fern, the metasequoia, the bald Chinese fir, the cathaya argyrop-hylla, and the dove tree, known as ''living fossils''. With its extremely plentiful medicinal herbs, Chongqing is a major producer of Chinese medicine in the country. There are over 560 kinds of cultivated plants in Chongqing, mainly in four categories: rice, corn, wheat and sweat potatoes. Of the major cities in China, Chongqing is the richest in mineralresources.