As this is a cleptoparasitic species, all flower visits will be for nectar only.
In Britain, the species has been observed visiting Ranunculus ficaria (Ranunculaceae); Ribes nigrum (Grossulariaceae); Salix (Salicaceae); and Taraxacum (Asteraceae)(R. Gabriel, pers. comm.).
In Germany, F.K. Stöckhert (1933) additionally lists Tussilago farfara (Asteraceae).