Polylectic; pollen sources include Fabaceae, Echium (Boraginaceae), Helianthemum (Cistaceae), Scabiosa (Dipsacaceae) and Ajuga (Lamiaceae) (Amiet et al., 2004; Westrich, 1989; A. Müller, unpublished, based on 8 pollen samples from 3 different localities).