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We evaluated relationships between floral traits of 23 genotypes of southern blueberries and indices of pollination efficiency (fruit set, fruit abortion, seed number, and berry size) for  Osmia ribifloris  Cockerell, a manageable solitary bee. Flower size in  Vaccinium  and presumably ovary size were proportional to berry size, except for the tiny blooms of one  V. tenellum  clone (NC7808), which produce large commercial-sized berries of ≈2 g. Longer-styled blueberry flowers visited by  O. ribifloris  produced the heaviest berries with the most seeds.  Osmia ribifloris  reliably pollinated ‘Climax’ and ‘Tifblue’ rabbiteye blueberries. However, the peculiarly misshapen blooms of ‘Premier’ rabbiteye blueberry receive less pollination from  O. ribifloris  and yield berries containing 25% fewer seeds. Fruit set for these misshapen ‘Premier’ flowers was equivalent to that of intact flowers indicating that this floral polymorphism would not greatly alter cultivar performance. For seven  Vaccinium  species, wild and cultivated alike, 80% to 100% of a plant’s fruit production depends on efficient cross-pollination by bees such as  O. ribifloris .

Blueberry Floral Attributes and Their Effect on the Pollination Efficiency of an Oligolectic Bee, Osmia ribifloris Cockerell (Megachilidae: Apoidea)