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Abstract
Monoterpene composition was studied in a number of hard pine species and results were compared with earlier work. (1) Intratree measurements showed strong constancy of composition in both single-stemmed and forked trees of ponderosa, Jeffrey, Coulter, and Jeffrey x ponderosa pines. In grafts of these and other pines, the scion influenced the root stock, but not the reverse. (2) Large intertree variation in composition was found in a small sample of seven hard pines native to Mexico; the value of monoterpenes in clarifying taxonomy of these pines remains uncertain. (3) An 80-tree plot of ponderosa is adequate to determine average monoterpene composition. For the best estimate of the kinds and abundance of types of composition, a 350-tree plot is needed. Short-column chromatographic analysis is acceptably accurate for rapid classification of a large number of samples.
Keywords
xylem monoterpenes,
Pinus ponderosa,
P coulteri,
P jeffreyi,
P torreyana,
P sabiniana,
P montezumae,
P hartwegii,
P rudis,
P pseudostrobus,
P durangensis,
P cooperi,
P engelmannii
Citation
Smith, Richard H. 1982. Xylem monoterpenes of some hard pines of Western North America: three studies. Res. Pap. PSW-RP-160. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 7 p.
