Müller (1996) states that this is a polylectic species, with a strong preference for Papilionoideae (Fabaceae) pollen. Fabaceae pollen accounted for 80% of the pollen collected, followed by Lamiaceae with 13.5% (cited in Kasparek, 2017)
Pollen analysis (Müller, 1996) revealed the following pollen sources: Fabaceae with lesser amounts of Rosaceae, Cistaceae, Boraginaceae, Lamiaceae and Plantaginaceae