New Zealand Journal of Botany abstracts

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Turpentine composition of the pines of Guadalupe and Cedros islands, Baja California

M. H. BANNISTER

Forest Research Institute
Private Bag, Rotorua, New Zealand

I. R. C. McDonald

Chemistry Division, DSIR
Private Bag, Wellington, New Zealand AbstractSamples of oleoresin were collected from natural populations of pines on Guadalupe and Cedros islands, Baja California. The monoter-penes of the individual trees were analysed by gas-liquid chromatography and compared with those oi Pinus radiata and P. muricata as found in nature and in cultivation. In all the samples from the two islands the main constituents were ot-pinene and p-pinene. There was wide tree-to-tree variation in the proportions of these, and a strong over-all similarity to the monoterpenes found in the three natural populations of P. radiata on the mainland of California. On average, p-pinene was 75% of the total for Guadalupe Island and 80% for Cedros Island. From the taxonomic point of view, these results support (1) the inclusion of the Guadalupe Island population in P. radiata; (2) the recent transfer of the Cedros Island populations from P. muricata to P. radiata, with the new combination P. radiata var. cedrosensis (Howell) Axelrod.

Keywordsmonoterpenes; P-pinene; Pinus radiata; Pinus muricata; Guadalupe Island; Cedros Island; chemotaxonomy

Received 24 September 1982; revision 16 June 1983
New Zealand Journal of Botany, 1983, Vol. 21: 17?>-?>11 0028-825X/83/2104-0373$2.50/0 © Crown copyright 1983

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