AsTRACT.-Three closely related species of the ponderosa pine complex occurr sympatrically over portions of their ranges in the southwestern USA: Pinus ponderosa, P. arizonica, and P. engelmannii. Discriminant function analysis and a separate analysis of the presence of diagnostic characters were used to identify three putative three-way hyrbrids among these species. Pinus ponderosa Laws., P. arizonica Engelm., and P. engelmannii Carr. are closely related and occur sympatrically in the southwestern United States and adjacent Mexico. Results of a previous study indicated that under natural conditions interspecific hybrids may be produced in all combinations among the three species (Peloquin, 1971). The purpose of the present study was to determine whether three-species hybrids also occur.
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R. L. Peloquin (1984) studied this question.
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