Oligolectic on Campanulceae, especially Campanula patula and Campanula trachelium. (Pesenko, Banaszak et al., 2000). Pekkarinen (1998) lists only Campanula (Campanulaceae) as a pollen source in Finland.
Pesenko in Banaszak (1995) state that this is an oligolectic species, specialising in Campanulaceae.
Other flower records are for Hieracium pilosella (Asteraceae), Dryas octopetala (Rosaceae) and Calluna vulgaris (Ericaceae) Ebmer, 1984). Campanula rotundifolia, Campanula cochleariifolia, Campanula glomerata and Campanula trachelium (Campanulceae)(Westrich, 1989)