Pacific Southwest

Title: Xylem Monoterpenes of Some Hard Pines of Western North America: three studies

Author: Smith, Richard H.

Date: 1982

Source: Res. Paper PSW-RP-160. Berkeley, CA: Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture; 7 p

Station ID: RP-PSW-160

Description: 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

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Citation

Smith, Richard H.   1982.  Xylem Monoterpenes of Some Hard Pines of Western North America: three studies.   Res. Paper PSW-RP-160. Berkeley, CA: Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture; 7 p.