Technical Abstract: We compared the native bees visiting the flowers of three species of invasive plants (Tamarix spp., Melilotus albus, M. officinalis) with those visiting seven native plant species in mid-summer at three sites in Capitol Reef National Park, UT, USA. Overall, as many species of bees visited the flowers of invasive plants as visited those of natives. On average, invasive species were visited by twice as many species of bees as were natives. With a single exception, visitors of invasives were mostly generalist bees, rather than specialists. Colletes petalostemonis, the only legume specialist recorded, was an abundant forager on the flowers of both species of Melilotus demonstrating that at least some specialist bees will move to invasive plants that are closely related to their usual hosts. Species abundant on the flowers of invasives tended to collect both pollen and nectar suggesting that bees are using pollen of Tamarix and Melilotus to provision their offspring. We argue that invasives neither facilitate the reproduction of uncommon natives nor consistently compete with natives for pollinators. Rather, they are likely to selectively increase the carrying capacity and population size of native bees, specifically generalists and specialists of closely related plant species.