Melissopalynological analysis of six honey samples, commercially rejected for its fetid odour, was performed. These honeys were produced from Espinal and Pampeana Phytogeographical Provinces. The main nectar sources that characterized monofloral honeys belong to the following families: Rhamnaceae (Discaria americana, Scutia buxifolia) and Calyceraceae (Acicarpha tribuloides) along with pollen of S. buxifolia as secondary. According with the results of the present study it seems that the odour has its origin in the Rhamnaceae flowers