Oligolectic: Campanula and Phyteuma (Campanulaceae). (Westrich, 1989) lists the following species as pollen sources: Campanula persicifolia, C. glomerata, C. patula, C. rapunculus, C. sibirica, C. poscharskayana.
Dylewska (1987) lists Campanula sibirica (Campanulaceae); Geranium sp. (Geraniaceae); and Veronica chamaedrys (Plantaginaceae) as forage sources.
Pesenko in Banaszak (1995) state that this is an oligolectic species, specialising in Campanulaceae.
Occasionally visiting flowers of Potentilla (Rosaceae) and Lavatera (Malvaceae) (Tomozei, 2014).