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With the aim of ordering and classifying fruit morphological diversity of 31 variants acknowledged by more than 20 pitahaya [Stenocereus pruinosus (Otto) Buxb.] growers from the Mixteca Baja, Mexico, we measured 19 morphological traits of 200 groups (2 to 10 per variant). Data were analyzed using mean comparison, cluster and principal components analyses. Informants identified variants by fruit color, size and shape; thorn size and color; seed size and amount; sweetness, taste and maturation season. Even though five traits were significantly equal, multivariate analysis supported that 16 of these traits were pertinent for variant characterization. The first three principal components (CP) summarized 60 % of the variation and ordered variants by fruit size and weight and seed and thorn size (CP1), by skin and pulp color (CP2), and by fruit roundness (CP3); coinciding with the intraespecific traditional classification. A grouping congruent with these analyses defines nine groups, one of them corresponding to a possible interespecific hybrid. The empirical classification from informants was largely confirmed by statistical analyses.

CLASIFICACIÓN Y ORDENACIÓN MORFOLÓGICA DEL FRUTO DE VARIANTES CULTIVADAS DE PITAYA [Stenocereus pruinosus (Otto) Buxb.] EN LA MIXTECA BAJA, MÉXICO