Polylectic. The main pollens utilized in a Peak District locality were: Ulex europaeus, Trifolium repens, Lotus corniculatus (Fabaceae); Calluna vulgaris, Vaccinium vitis-idaea and V. myrtillus (Ericaceae)(Yalden,1982).
Rasmont (1988) lists the following forage species: Polygonum bistorta (Polygonaceae); Silene vulgaris, Silene acaulis (Caryophyllaceae); Trollius europaeus (Ranunculaceae); Alchemilla alpina (Rosaceae); Trifolium sp., Trifolium alpinum, Trifolium thalii, Lotus corniculatus, Lotus alpinus, Onobrychis sp. (Fabaceae); Epilobium sp., Epilobium angustifolium (Onagraceae); Calluna vulgaris, Rhododendron sp., Rhododendron ferrugineum, Vaccinium sp., Vaccinium uliginosum, Vaccinium myrtillus (Ericaceae); Primula sp. (Primulaceae); Swertia perennis (Gentianaceae); Cerinthe glabra, Echium sp. (Boraginaceae); Linaria repens, Pedicularis sylvatica (Scrophulariaceae); Knautia sp. (Dipsacaceae); Carduus carlinifolius, Carduus carlinoides (Asteraceae)
M. Macdonald (HBRG Website) additionally lists the following pollen forage plants in Scotland: Arctostaphylos uva-ursi, Erica cinerea, Erica tetralix (Ericaceae) and Salix spp.(Salicaceae) The main nectar forage plants for males are Succisa pratensis (Dipsacaceae) and Senecio jacobaea (Asteraceae).
It also visits Cardamine pratensis (Brassicaceae); Viola (Violaceae); Ulex gallii (Fabaceae); Silene vulgaris (Caryophyllaceae); Rubus, Potentilla (Rosaceae); Saxifraga oppositifolia (Saxifragaceae); Chamaenerion angustifolium (Onagraceae); Salix (Salicaceae); Rhododendron ponticum, Erica tetralix, Erica ciliaris, Erica cinerea, Erica vagans (Ericaceae); Pedicularis sylvatica (Orobanchaceae); Prunella vulgaris (Lamiaceae); Jasione montana, Phyteuma globulariifolium (Campanulaceae); Senecio jacobaea, Cirsium and Hieraceum pilosella (Asteraceae) but whether these represent additional pollen sources is not known.
Biesmeijer (pers comm) reports a visit to Primula farinosa (Primulaceae) in Yorkshire
A photograph in Söderman & Leinonen (2003), shows a specimen at flowers of Rhodiola rosea (Crassulaceae).
Rasmont (1988) lists the following plant families as providing forage: Onagraceae, Ericaceae and Rosaceae. Bossert (2014) reports foraging at Rhinanthus glacialis (Orobanchaceae) in the Austrian Tyrol