Pine (scientific name: Pinus) There are more than 80 kinds of pine trees in the world, which are not only various, but also widely distributed, such as Pinus tabulaeformis and Pinus sylvestris var. mongolica. Pinus sylvestris var. mongolica, Pinus thunbergii and Pinus densiflora distributed in several provinces of North China and Northwest China, Pinus massoniana, Pinus taiwanensis and Pinus alpine in several provinces of Central China, Pinus Bashan in Qinba Mountain area, Pinus Taiwan Province and Pinus brevifolia in North America. Most of them are the main tree species for afforestation in barren hills in China.
Pine trees are wheel-shaped branches with long internodes, thin and flat branchlets or slightly bent downward, and slender needles in bundles. Its crown looks loose but not compact, and the word "loose" is an image description of its crown characteristics. So "pine" is a tree with a loose crown. Pine trees are strong and have a long life.