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The relationships of the 18 taxa of the genus Juniperus in Mexico and Guatemala were examined using analysis of variance, multiple range tests, and numerical taxonomic methods on the 64 morphological characters used. Four species complexes were apparent. The "flaccidan" complex consisting of two varieties of J. deppeana. Juniperus patoniana Martínez which is closely associated with varieties of J. deppeana and is treated as a variety of J. deppeana. Juniperus durangensis, J. standleyi, and all three forms of J. monticola comprise the "monticolan" complex. The one-seed complex includes J. comitana, J. erythrocarpa, J. gamboana, J. monosperma var.gracilis, and J. saltillensis. Juniperus erythrocarpa var.coahuilensis was not different from J. erythrocarpa. Two species, J. blancoi and J. jaliscana, do not appear to be related to the other cedars of Mexico and Guatemala.