Deciduous trees, with alternate leaves, ovate or ovate-lanceolate, catkin inflorescence, many kinds, such as poplar, Populus macrophylla, Populus simonii and so on. Wood can be used as a vessel: willow. "Yang" means the sun, which consists of "wood" and "bamboo". "Wood" refers to Fusang, also known as poplar, which grows in Tanggu (now Lianyungang Canal Mountain) on the coast of the East China Sea. "Cloud" is a homonym with "Yang" in ancient times, which is an image description of "Sunrise Tanggu".