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Osmia nigrobarbata is a species of Hymenoptera in the family leafcutting bees. They visit flowers of Branching Penstemon, Ackerman's milkvetch, Guadalupe Island lupine, and Wassuk Range beardtongue.

EOL has data for 6 attributes, including:

Known occurrences, collected specimens and observations of Osmia nigrobarbata Cockerell 1916 from the Global Biodiversity Information Facility   GBIF provides free and open access to biodiversity data. View this species on GBIF