Pollen spectrum of the two bee species. a Ten most abundant families as collected by the bee species O. bicornis and O. truncorum. For O. truncorum ‘other’ include the families Apiaceae, Rosaceae, Fabaceae, Ranunculaceae, Plantaginaceae, Juglandaceae and Amaranthaceae. b Plant genera detected within the Asteraceae collected by O. truncorum. For visualisation reasons, only the eight most abundant genera are labelled. Please note that Aceraceae is now included within Sapindaceae.