This dataset provides information about 3496 preserved specimens of vascular plants from 1289 species and subspecies and 97 families. The specimens were collected in the PhD project of Garde (1990), project that includes her undergraduate thesis (Garde 1981), that assessed the vascular flora of Ribera Occidental de Navarra (NE Iberian Peninsula, Spain). An inventory was conducted based on fieldwork and taxa were identified. From them, 58 were mentioned as new records for the province of Navarra at the moment of the study.