ABSTRACT Pollinators provide important ecosystem services in human-developed areas, including pollination for urban green spaces and agriculture. As developers aim to become more eco-friendly, understanding pollinator dynamics in these settings will help enhance pollinator services. Mountain mint plants (Pycnanthemum spp.; Lamiaceae) are commonly grown in urban green spaces and may provide resources to a large range of pollinators. There is a limited understanding, however, of the Pycnanthemum spp.–pollinator relationship. In this study, we used visual monitoring and DNA barcoding to evaluate flower visitor richness over the extended bloom duration of two native species of Pycnanthemum spp. in the greater Richmond area of Virginia (USA). We recorded a total of 85 taxa on Pycnanthemum muticum and 43 on Pycnanthemum tenuifolium flowers. In most cases, our visual monitoring results were confirmed or refined with DNA barcoding, enabling us to build a flower visitor barcode library for the region. The taxon assemblages varied between the two observed Pycnanthemum spp. in general, and over time, demonstrating that these plant species provide resources across taxa and are therefore good candidates for bolstering pollinators when developing urban green spaces.
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