An oligolectic species, specialising on Echium (Boraginaceae), and in Germany, Echium vulgare. (Amiet et al., 2004; Banaszak and Romasenko, 2001; Stanisavljević, 2000; Eickwort, 1973, 1975; Gogala, 1999; Westrich, 1989; A. Müller, unpublished, based on 24 pollen samples from 17 different localities).