Polylectic. Westrich (1989) list the following plant species as pollen sources: Hypochoeris radicata (Asteraceae); Bryonia dioica (Cucurbitaceae); Potentilla verna, Potentilla anserina, Potentilla reptans, Malus domestica, Pyrus communis, Prunus armeniaca (Rosaceae); Salix cinerea, Salix aurita (Salicaceae).
Ebmer (1971) lists Centaurea (Asteraceae) and Scabiosa (Dipsacaceae) as forage species.
Pawlikowski & Kruszynski (1997) list Echium vulgare (Boraginaceae) and Lamium album (Lamiaceae) as forage sources in Poland.
Knuth (1906) citing himself and others, reports pollen collecting at Ranunculus aquatilis (Ranunculaceae).