Figure 1

Tree-ring photographs of four species of pine (Pinus): A) ponderosa pine (P. ponderosa), B) longleaf pine (P. palustris), C) slash pine (P. elliottii), and D) South Florida slash pine (P. densa). Although ring characteristics vary within a given species and individual tree, the proportion of latewood in longleaf, slash, and South Florida slash pine is typically higher than in ponderosa pine and many other species found in the western USA. Sample collector and location: A) M. Rother, Zuni Mountains, New Mexico; B) Jean Huffman, St. Joseph Bay State Buffer Preserve, Florida; C) Jean Huffman, Little St. George Island, Florida; and D) G. Harley, No Name Key, Lower Florida Keys, Florida.