Tim Fitzharris / Evening Primrose (Oenothera erythrosepala) and Prairie Verbena, North America

Heather Angel / Evening primrose (Oenothera glazioviana) flowering at dusk in garden, Surrey, England, UK. August.

Heather Angel / Large-flowered evening primrose (Oenothera glazioviana). Bull's eye in centre of flower fluorescing in UV light guides pollinators to nectaries. At night in garden. Surrey, England, UK.

Heather Angel / Honey bee (Apis mellifera) carrying pollen strings from previous flower into Evening primrose (Oenothera glazioviana). At night in garden. Surrey, England, UK. July.

Heather Angel / Silver Y moth (Autographa gamma) nectaring on Evening primrose (Oenothera glazioviana) with proboscis extended. At night in garden. Surrey, England, UK. August.

Heather Angel / Red-tailed bumblebee (Bombus lapidarius) picking up pollen strings in Large-flowered evening primrose (Oenothera glazioviana). Flowers remains open on cool mornings allowing diurnal species to nectar....

Tom Vezo / Evening Primrose (Oenothera sp) flowers in desert, Joshua Tree National Park, California

Tom Vezo / Evening Primrose (Oenothera sp) flowers in desert, Joshua Tree National Park, California

Tim Fitzharris / Drummond's Phlox (Phlox drummondii) and Evening Primrose (Oenothera sp) near Leming, Texas

MYN / Niall Benvie / Large flowered Evening primrose (Oenothera glazioviana) in flower, Dundee, Scotland, August. meetyourneighbours.net project

Niall Benvie / Large flowered Evening primroses (Oenothera sp) in flower against white background sheet, about to be photographed in outdoor studio set up in the field, Dundee, Scotland

Tim Fitzharris / Evening Primrose (Oenothera erythrosepala) with Grizzly Bear Cactus (Opuntia erinacea), North America