Presumed to be polylectic.
Rasmont (1988) lists the following forage species: Trollius europaeus (Ranunculaceae); Sedum ochroleucum (Crassulaceae); Astragalus sp., Astragalus alpinus, Astragalus sempervirens, Vicia sp., Trifolium sp., Trifolium alpinum, Trifolium pratense, Anthyllis vulneraria, Anthyllis vulneraria pyrenaica, Onobrychis sp. (Fabaceae); Hypericum nummularium (Cistaceae); Echium vulgare (Boraginaceae); Teucrium pyrenaicum, Sideritis hyssopifolia, Stachys alopecuros, Acinos alpinus, Horminum pyrenaicum (Lamiaceae); Rhinanthus sp., Rhinanthus alectorolophus (Scrophulariaceae); Jasione crispa (Campanulaceae); Carduus carlinifolius, Carduus carlinoides, Cirsium eriophorum, Centaurea sp. (Asteraceae).
Ornosa & Ortiz-Sánchez (2004) list the following families of plants as providing forage: Fabaceae, Boraginaceae, Asteraceae and Scrophulariaceae.