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