| Samenvatting: | Using morphological and anatomical traits of cones, leaves and branchlets, the geographic pattern of variation was evaluated in natural populations of Pseudotsuga in Mexico. Vegetative and reproductive samples were collected from a total of 293 trees in 19 populations located throughout the native range of this genus in Mexico. Characters considered as important from a taxonomic point of view were included in order to verify the taxonomic boundaries of the components of this genus in the region. A strong differentiation among populations was detected for most morphological and anatomical traits, with 22 to 92% of the phenotypic variation residing at this level. The geographical region of origin had an important role in the separation of samples, suggesting the presence of geographic ecotypes of Pseudotsuga in Mexico. Given the fact that differentiation associated with putative taxa was much lower than differentiation associated to geographic regions, it is concluded that there are no morphological bases to separate the Pseudotsuga species that have been proposed earlier for Mexico.
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