 Main Divide N, fr Bedford Pk. to .8 mi E Pleasants Peak, Cleveland National Forest, Orange County, CA., 7-14-11. © Ron Vanderhoff. |
Knobcone Pine Pinus attenuata An example of a serpentine-endemic plant. Pleasants Peak is the only area within Orange County that contains serpentine soil (from a rock called serpenitite) and the only area where Pinus attenuata occurs naturally. Serpentine endemics have evolved to tolerate the extreme conditions of serpentine soil, which include low calcium-to-magnesium ratio, lack of essential nutrients such as nitrogen, potassium, and phosphorus, and high concentrations of heavy metals.Back to Pinaceae of Orange County, California |
 Main Divide N, fr Bedford Pk. to .8 mi E Pleasants Peak, Cleveland National Forest, Orange County, CA., 7-14-11. © Ron Vanderhoff. |
 Main Divide N, fr Bedford Pk. to .8 mi E Pleasants Peak, Cleveland National Forest, Orange County, CA., 7-14-11. © Ron Vanderhoff. |
 Main Divide N, fr Bedford Pk. to .8 mi E Pleasants Peak, Cleveland National Forest, Orange County, CA., 7-14-11. © Ron Vanderhoff. |
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 Main Divide N, fr Bedford Pk. to .8 mi E Pleasants Peak, Cleveland National Forest, Orange County, CA., 7-14-11. © Ron Vanderhoff. |
 Main Divide N, fr Bedford Pk. to .8 mi E Pleasants Peak, Cleveland National Forest, Orange County, CA., 7-14-11. © Ron Vanderhoff. |
 S. Main Divide, nr Morgan Trailhead, 3-24-11. © Ron Vanderhoff. |
 Main Divide N, fr Bedford Pk. to .8 mi E Pleasants Peak, Cleveland National Forest, Orange County, CA., 7-14-11. © Ron Vanderhoff. |
 Serpentine soil, 0.3 mi W Pleasants Peak, Cleveland National Forest, Orange County, CA., 10-28-12. © Ron Vanderhoff. |
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 Pinus attenuata on serpentine soil, 0.4 mi W Pleasants Peak, Cleveland National Forest, Orange County, CA., 10-28-12. © Ron Vanderhoff. |
 Serpenitite rock. 0.3 mi W Pleasants Peak, Cleveland National Forest, Orange County, CA., 10-28-12. © Ron Vanderhoff. |
