A polylectic species. The following species are known pollen sources in Germany: Centaurea cyanus, Centaurea jacea, Centaurea scabiosa, Cichorium intybus, Picris hieracioides, Hieracium pilosella (Asteraceae); Campanula rotundifolia (Campanulaceae); Helianthemum nummularia (Cistaceae); Convolvulus arvensis (Convolvulaceae); Papaver rhoeas (Papaveraceae) (Westrich, 1989).
Stratan (1998) lists the following forage sources in Moldova: Coronilla varia (Fabaceae).
Banaszak & Romasenko (1989) list the following forage sources: Campanula (Campanulaceae); Centaurea (Asteraceae); Papaver (Papaveraceae); Melilotus (Fabaceae). This information is cited in Matache & Ban (2006).
A. Müller, (unpublished, based on 2 pollen samples from 2 different localities) adds Echium (Boraginaceae)