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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]
Arceuthobium siskiyouense is a species of dwarf mistletoe known as knobcone pine dwarf mistletoe. It is endemic to the Klamath Mountains of northern California and southern Oregon , where it lives as a parasite on knobcone pine trees.
From the Tulelake Basin in the north to the Fall River valley in the south, the 360 degree view offers a view at some of northern California's most notable scenery. There is also Hirz lookout near Lake Shasta and the Post Creek lookout (somewhat near the town of Platina, on the southern end of the forest).
The trees of Closed-cone pine forest burned in every 25–50 years, and a few species including the knobcone pine (Pinus attenuata) are adapted to open the cones and release seeds for new growth following the heat of forest fires. However, as fire regulation and suppression becomes more effective these communities cannot renew themselves.
The most widespread naturally of the closed-cone pines is bishop pine (Pinus muricata), which can be found along the coast from Humboldt County, California in the north to the northwestern corner of Baja California in the south. Knobcone pine (Pinus attenuata) forests can occur further inland, on dry, rocky soils.
Common pines are lodgepole pine (Pinus contorta), bishop pine (Pinus muricata), Monterey pine (Pinus radiata), and knobcone pine (Pinus attenuata). These forests can also be home to several endemic cypresses, including Monterey cypress (Cupressus macrocarpa), Gowen cypress (Cupressus goveniana), and Santa Cruz cypress (Cupressus abramsiana).
Pinus peuce × P. strobus – Balkan pine × eastern white pine; Pinus peuce × P. parviflora – Balkan pine × Japanese white pine; Pinus flexilis × P. wallichiana – Limber pine × Himalayan pine; Pinus flexilis × P. strobus [11] – Limber pine × eastern white pine; Pinus flexilis × P. ayacahuite – Limber pine × Mexican white pine
Pinus, the pines, is a genus of approximately 111 extant tree and shrub species. The genus is currently split into two subgenera: ... P. attenuata – knobcone pine;