1, pine trees are not afraid of cold and soil, and their tenacious vitality is amazing. Just like those who persevere, no matter what difficulties they face, they can stick to the end and finally realize their goals and dreams.

2. Pine tree is a symbol of evergreen, representing the eternal and unyielding spirit and inspiring people to forge ahead.

3. The tall and strong pine tree is its love and persistence for life. Even in a dangerous environment, it can thrive. This is just like human beings, tempering themselves in adversity and growing into stronger individuals.

Pine trees are introduced as follows:

Pinus (scientific name: Pinus? It is the next genus of Pinaceae. The plants of this genus are evergreen trees and rare shrubs; Branches are rotating, and bud scales are numerous and arranged like tiles. There are two kinds of leaves: scale leaves (primary leaves) are solitary and spiral; The needles (secondary leaves) are arranged spirally and radially, usually in a bundle of 2, 3 or 5 needles, and the base of each bundle of needles is covered by a leaf sheath composed of 8- 12 bud scales.

Cones are unisexual and monoecious; Male peanut is located in the axil of the lower bract of the new branch; Female cones are solitary or 2-4 are born near the top of new branches, erect or drooping, and consist of most spiral bead scales and bracts. After fertilization in the second spring, the cones grew rapidly and stood upright or drooped. In the second year (rare third year), the cones mature in autumn, and the seed scales open when they mature.

The botanical history of pine trees is introduced as follows:

1753, Linnaeus established Pinus (Pinus? Lynn. ), but at this time the pine forest is mixed with fir, spruce and cedar. Until 1857, these three genera were established one after another, and the species mixed in Pinus had a correct attribution, and Pinus formed a relatively fixed pattern.

In 1893, Koehne divided Pinus into groups. Haploxylon and the Sect. People have realized the importance of vascular bundles in the classification of Pinus. In 19 14, Show further divided the single vascular bundle pine group into 2 subgroups and 5 subgroups, and divided the double vascular bundle pine group into 2 subgroups and 7 subgroups.

The origin of pine trees is introduced as follows:

The fossil records of Pinus in Cretaceous and Cenozoic strata in the northern hemisphere are very rich, mainly including cones, winged seeds, needles and wood, which were the main components of forests in the northern hemisphere at that time. Axelrod( 1986) describes the Cenozoic history of Pinus in the western United States.