Figure 2
From: Age and Structure of Mature Knobcone Pine Forests in the Northern California Coast Range, USA
Map of study area showing locations of the 21 knobcone pine stands on the northern Mayacmas Mountains, northern California. The southernmost plot (U) is located in the University of California Hopland Research and Extension Center. Patterned letters refer to four groupings identified from a cluster analysis using tree age data. Cluster 1 has gray letters with black borders, and represents the oldest even-aged stands; Cluster 2 has black letters, and represents stands established ca. 1943; Cluster 3 has gray letters and represents uneven-aged stands; and Cluster 4 includes the youngest stands (see Figures 3 and 5).