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When the abundance and the composition of pollinators are unpredictable, exploitation of a diverse assemblage of pollinators is important for plant reproduction. To examine the role of floral traits in attracting diverse pollinators, we performed a field study using the zygomorphic flowers of Isodon trichocarpus. We investigated variation in floral traits among flowers and seasonal variation in pollinator assemblage and determined whether pollinator behaviour is linked to floral traits. We compared pollinator diversity among flowers by flower-based rarefaction and extrapolation. Pollinator diversity increased with span of corolla opening. The number of bumble bee visits increased with upper lip height. During the flowering period, there were only 2 days when all pollinator groups (wasps, bumble bees, small bees and hoverflies) were observed, and there were 4 days when only one group was observed. Thus, the …