Ponderosa pine Pinus ponderosa Location: Sunset Crater National Monument, near Flagstaff, AZ Year: 2009 Merckslides catalogue number: 05-70502 Comments:

Ponderosa pine Pinus ponderosa Location: Walnut Canyon National Monument, near Flagstaff, AZ Year: 2009 Merckslides catalogue number: 05-70420 Comments:

Ponderosa pine on lava flow of Sunset Crater Pinus ponderosa Location: Sunset Crater National Monument, near Flagstaff, AZ Year: 2009 Merckslides catalogue number: 05-70491 Comments:

Ponderosa pine with dead main trunk Pinus ponderosa Location: Sunset Crater National Monument, near Flagstaff, AZ Year: 2009 Merckslides catalogue number: 05-70488 Comments:

Spiral growth in dead ponderosa pine Pinus ponderosa Location: Sunset Crater National Monument, near Flagstaff, AZ Year: 2015 Merckdigitals catalogue number: 05-70488 Comments:

Ponderosa pine Pinus ponderosa Location: Sunset Crater National Monument, near Flagstaff, AZ Year: 2016 Merckdigitals catalogue number: 05-70488 Comments:

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