1. Features: No matter how bad the environment is, pine trees still grow upright and are regarded as a symbol of integrity and simplicity. Tall and thin, with poor shade, it belongs to the South American fir population. Pines are evergreen and a few are shrubs. Bark has scales, needles and spherical fruits, and the seeds are called pine nuts, which can be eaten. Wood and resin are widely used.

2. Appearance characteristics, evergreen trees. Most of them are tall and straight trees. The most obvious feature is that the leaves are needle-shaped, usually two, three or five needles are tied together. The canopy looks loose and not compact. Dark green, with stomatal lines on both sides of abdomen and back, and fine serrations on the edge. Flowers bloom in March and April. In the second year 10- 1 1 month, the fruit is mature, and the cones are long and conical, with two or three clusters. Seeds ovoid, trigonous.