The mating system and allozyme variation at 20 loci in three Klamath Mountains and two Sierra Nevada populations of Jeffrey pine ( Pinus jeffreyi Grev. & Balf.) were investigated. On average, multilocus estimates of the proportion of viable progeny due to outcrossing (t m ) were high in all populations (mean t m = 0.935, range 0.881 to 0.971). Despite differences in stand structure, t m did not differ ( P > 0.05) between the Klamath (mean t m = 0.933) and Sierra Nevada (mean t m = 0.937) populations. At all but one locus in one population and at two in another, genotype frequencies fit ( P > 0.05) Hardy‐Weinberg expectations. Mean estimates of observed heterozygosity in Klamath (0.182) and Sierra Nevada (0.327) populations were comparable to values reported for other conifers.
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Furnier et al. (1986) studied this question.
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