Forms
There are two Pinus muricata forms:
- a southern form with bright green needles
- a northern form with dark blue-green needles.
The resin composition also differs. The dividing line between the two is very sharp, five miles (8 km) south of the boundary between Mendocino County and Sonoma County, California. Experimental attempts to hybridize the two forms have consistently failed, indicating that their taxonomic relationship may be more distant than the very small differences in appearance would suggest.
Read more about this topic: Bishop Pine
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