Genus-level entry for the solitary, ground-nesting long-horned bees, named for the strikingly long antennae of males. Females forage heavily on the sunflower family (Asteraceae) — many species are oligolectic specialists on composites such as sunflowers, asters, and coneflowers — making them important late-season pollinators of native Asteraceae and of sunflower-family crops. They are most active in late summer and fall, when composite blooms peak; males famously roost overnight by gripping flower stems with their jaws.

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