Abstract
To investigate the nature of infraspecific variation in Larix laricina (Du Roi) K. Koch, 60 naturally established stands constituting 44 provenances were sampled from throughout the species' range. Cones were scored for nine traits and short-shoot needle transverse sections were scored for seven traits and 20 radial distances. Variation in all traits was minimal, with the greatest components expressed between trees within stands and within trees. Canonical variates analysis of needle traits demonstrated that provenances were differentiated according to location, whereas canonical variates analysis of cone traits showed a much weaker geographic trend. These results are consistent with the hypothesis that Alaska and northern Yukon provenances resulted from geographically separate migratory waves originating from different locations in the south following glacial recession. While Alaska provenances were distinguished from other provenances based on canonical variates analysis of needle data, but not of cone data, this distinction is insufficient to recognize Alaska tamaracks separately at either the species or varietal level.
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