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In the United States the pine tree Pinus palustris, known as the longleaf pine, once covered as much as 90,000,000 acres (360,000 km 2) but due to timber harvesting was reduced by between 95% and 97%. The trees grow very large (up to 150 feet), taking 100 to 150 years to mature and can live up to 500 years.
For some species of pine, such as Aleppo pine (Pinus halepensis), European black pine (Pinus nigra) and lodgepole pine (Pinus contorta), the effects of fire can be antagonistic: if moderate, it helps pine cone bursting, seed dispersion and the cleaning of the underwoods; if intense, it destroys these resinous trees. [citation needed]
Each plant may be a few inches tall, and pine-cone-shaped or cylindrical. The plant above ground is almost entirely made up of its inflorescence, a tightly packed column of thick cup-shaped flowers. The groundcone produces haustoria which penetrate the roots of its host and provide it with water and nutrients.
Pine oil is a higher boiling fraction from turpentine. Both synthetic and natural pine oil consists mainly of α-terpineol, a C10 alcohol (b.p. 214–217 °C). [5] [1] Other components include dipentene and pinene. [6] The detailed composition of natural pine oil depends on many factors, such as the species of the host plant. [7]
On the coast, the knobcone pine may hybridize with bishop pine (Pinus muricata), and Monterey pine (Pinus radiata). In the western foothills of the Sierra Nevada, knobcone pine is often a co-dominant with blue oak (Quercus douglasii). [7] The species is susceptible to fire, but this melts the cone resin, releasing seeds for regrowth. [4]
Examples of their use includes seasonal wreaths and decorations, fire starters, bird feeders, toys, etc. [13] An intriguing derivation of the impossible bottle mechanical puzzle takes advantage of the fact that pine cones open and close based on their level of dryness. In constructing a display, a closed, damp cone of suitable size is inserted ...