Abstract Dirca palustris L., eastern leatherwood or wicopy (Thymelaeaceae), a widely distributed shrub of eastern North America, flowers in early spring and so may face some of the same constraints faced by ephemeral vernal herbs of the eastern deciduous forest, most notably the influence of low temperature on pollinator activity. I studied the mating system of D. palustris and the influence of temperature on pollinator visitation of flowers, during three field seasons in a small stream valley in north‐western Pennsylvania, USA. Specifically, I was interested in how a species with apparently specialized floral morphology, like D. palustris, may ensure reproductive success in a thermally unpredictable vernal environment. Pollinator visitation of flowers of D . palustris was strongly regulated by temperature, with no visits occurring below 14.9°C. Lack of treatment effects in mating system studies, especially the lack of significant differences in fruit set between the
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