Flower-Visiting Insects
of Common Horse Gentian

Triosteum perfoliatum (Common Horse Gentian)
(Long-tongued bees suck nectar; short-tongued bees suck nectar or collect pollen and are non-pollinating; observations are from Robertson)

Bees (long-tongued)
Apidae (Bombini): Bombus bimaculatus sn, Bombus pensylvanica sn, Bombus vagans sn fq; Anthophoridae (Anthophorini): Anthophora abrupta sn; Anthophoridae (Ceratinini): Ceratina dupla dupla sn np

Bees (short-tongued)
Halictidae (Halictinae): Augochlorella striata sn cp np, Halictus rubicunda cp np