Data used in the manuscript "Incomplete partitioning of pollinators by Linum suffruticosum and its co-flowering congeners" accepted for publication in American Journal of Botany flower_morphology.csv includes measurements of floral traits Natural_pollen_arrival.csv includes data on pollen arrival on the stigmas and formation of pollen tubes of L. suffruticosum in sympatric and allopatric populations in the Central Pyrenees in Spain and SW Spain Lnarbonense_heterospecific_pollination.csc, Lviscosum_heterospecific_pollination.csv and Ltenue_heterospecific_pollination.csv correspond to the hand-pollination experiments using L. narbonense, L. viscosum and L. tenue as heterospecific pollen donors