Margined leatherwings find foxglove in early summer

Step outside into the long light of early summer, where the air holds warmth even as evening approaches. The foxglove beardtongue stands tall in the meadow edges around Ann Arbor, its white tubular flowers arranged in neat tiers along sturdy stems. Each bloom opens wide at the mouth, revealing purple guidelines that lead deeper into the throat.

On these flowers, margined leatherwing beetles work with methodical purpose. The beetles are soft-bodied and elongated, their wing covers a warm orange-yellow bordered by dark margins that give them their name. They move across the flower faces with deliberate steps, their antennae constantly probing. Unlike the quick visits of bees or the hovering of flies, these beetles settle in. They chew pollen directly from the anthers and lap nectar from the flower's base, their flexible bodies allowing them to reach deep into the tubular blooms.

The foxglove beardtongue depends on this partnership. The plant produces no scent to attract pollinators from a distance, instead relying on visual cues and the promise of abundant resources. Its flowers remain open for several days, giving beetles time to discover them and return. As the leatherwings feed, pollen grains stick to their fuzzy bodies and legs. When they move to the next flower, or the next plant, they carry this genetic material with them. The beetle's thorough feeding style means it contacts both anthers and stigma reliably, making it an effective pollinator despite its unhurried approach.

This relationship peaks now, in early summer, when both species reach their seasonal crescendo. The beardtongue has been building toward this moment since its leaves emerged in spring. The plant invested energy in tall stems and multiple flower spikes, each capable of producing hundreds of seeds if properly pollinated. The beetles, meanwhile, have been feeding on other flowers throughout late spring, building the energy reserves they need for reproduction. On warm afternoons, you might find several beetles on a single beardtongue plant, males and females feeding side by side, occasionally pausing to mate before returning to their methodical harvest.

The timing matters. Foxglove beardtongue blooms for only a few weeks, and the margined leatherwings must synchronize their adult emergence with this narrow window. Too early, and the flowers are not yet open. Too late, and the blooms have faded, the plant's energy redirected toward seed development. But when the timing aligns, as it does now, the meadow becomes a quiet theater of mutual benefit. The white flowers glow against their green backdrop, and the golden beetles move among them like small flames, carrying the future of both species in the pollen that dusts their bodies. Close your eyes and listen for the soft sound of their movement, the barely audible rustle as they shift from bloom to bloom in the warm, still air.