Tracing Plant Introduction and Spread: Genetic Evidence from Bromus tectorum (Cheatgrass)

possess the multilocus genotype characterized by the presence of Pgm-1a and Pgm-2a . These data suggest that this genotype may have first been introduced into the East and then spread westward with European settlers, or eastern and western populations with this genotype may be derived from separate introductions. Neither scenario can be rejected at this point.

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