Oligolectic: Fabaceae especially Medicago sativa. Other pollen sources include Trifolium pratense, Trifolium repens, Vicia cracca, Lathyrus sylvestris, Onobrychis viciifolia, Lotus corniculatus, Melilotus alba, and Astragalus onobrychis. (All Fabaceae) (Westrich, 1989).