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PONDEROSA
PINE - Pine Family
Pinus
ponderosa
Ponderosa Pine is the only long-needled pine at the South Rim. Needles
are usually five to nine inches long and come in bundles of three. The
tree attains a height of about 110 feet here, but up to 160 feet in the
more moist mountains of California. John Muir (1838-1914), the great naturalist
who is sometimes called the "father of our national parks," measured a
ponderosa in the Sierra Nevada that was 220 feet tall and 8 feet in trunk
diameter. Two to four feet in diameter is common for the large ponderosas
here at the South Rim. Cones are three to six inches. An exceptional ponderosa
may attain an age of 600 years.
Young ponderosas have rough black bark. Mature trees have thick orange-brown
bark that protects the tree from mild wildfire. In addition, mature trees
drop their lower branches in a process called self pruning. This prevents
brush fires from climbing to the crown. Such adaptations are useless in
extreme fire conditions such as those that prevailed in the summers of
2002 and 2003 in many western states. Fortunately, the Grand Canyon was
spared. |