Oligolectic on various species of Campanula (Campanulaceae)(Pesenko in Banaszak, 1995; Pekkarinen, 1998, Gogala, in litt. Amiet et al., 2004; Westrich, 1989; A. Müller, unpublished, based on 3 pollen samples from 3 different localities and field observations).
Rust et al (2004) list Campanula rotundifolia (Campanulaceae) as a pollen forage source.