Jack Dykinga / Birdcage evening primrose (Oenothera deltoides) and desert golds (Geraea canescens) carpet the sandy washes beneath the Calumet Mountains at dawn. Mojave Trail National Monument, Mojave Desert, Califo...

Jack Dykinga / Birdcage evening primrose (Oenothera deltoides) and desert golds (Geraea canescens) carpet the sandy washes beneath the Calumet Mountains, under the Milky Way. Mojave Trail National Monument, Mojave D...

Jack Dykinga / Birdcage evening primrose (Oenothera deltoides) flowering in the sand dune flats near Joshua Tree National Park, California, USA, March.

Jack Dykinga / Desert landscape with flowering Sand verbena (Abronia), Desert gold (Geraea canescens), and Birdcage evening primrose (Oenothera deltoides), with the Santa Rosa Mountains in background. Anza-Borrego...

Jack Dykinga / Desert landscape at sunset, with flowering Sand verbena (Abronia), Desert gold (Geraea canescens), and Birdcage evening primrose (Oenothera deltoides), with the Santa Rosa Mountains in background. An...

Jack Dykinga / Desert landscape with flowering Sand verbena (Abronia), Desert gold (Geraea canescens), and Birdcage evening primrose (Oenothera deltoides), with the Santa Rosa Mountains in background. Anza-Borrego...

Jack Dykinga / Desert landscape with flowering Sand verbena (Abronia), Desert gold (Geraea canescens), and Birdcage evening primrose (Oenothera deltoides), with the Santa Rosa Mountains in background. Anza-Borrego...

Jack Dykinga / Whipple Mountain foothills, with flowering Notch-leaf scorpion-weed (Phacelia crenulata) and Heartleaf evening primrose (Camissonia cardiophylla) with the Riverside and Big Maria Mountains in the back...

Jack Dykinga / Whipple Mountain foothills, with flowering Notch-leaf scorpion-weed (Phacelia crenulata) and Heartleaf evening primrose (Camissonia cardiophylla) with the Riverside and Big Maria Mountains in the back...

Jack Dykinga / Whipple Mountain foothills, with flowering Notch-leaf scorpion-weed (Phacelia crenulata) and Heartleaf evening primrose (Camissonia cardiophylla) with the Riverside and Big Maria Mountains in the back...

Jack Dykinga / 1563786 - - Desert landscape with flowering Sand verbena (Abronia), Desert gold (Geraea canescens), and Birdcage evening primrose (Oenothera deltoides), with the Santa Rosa Mountains in background. An...

Jack Dykinga / Close up of flowering Sand verbena (Abronia) and Birdcage evening primrose (Oenothera deltoides) Anza-Borrego State Park, California, USA. March 2017. These plants are flowering during on largest 'su...

Jack Dykinga / Flowering Sand verbena (Abronia) and Birdcage evening primrose (Oenothera deltoides) close up, Anza-Borrego State Park, California, USA. March 2017. These plants are flowering during on largest 'supe...

Jack Dykinga / Whipple Mountain foothills, with flowering Notch-leaf scorpion-weed (Phacelia crenulata) and Heartleaf evening primrose (Camissonia cardiophylla) with the Riverside and Big Maria Mountains in the back...

Jack Dykinga / Desert landscape with flowering Sand verbena (Abronia), Desert gold (Geraea canescens), and Birdcage evening primrose (Oenothera deltoides), with the Santa Rosa Mountains in background. Anza-Borrego...

Andy Sands / Jumping spider (Evarcha arcuata) on edge of evening primrose flower, Surrey, England, UK, August

Jack Dykinga / White flowering birdcage evening primrose (Oenothera deltoides) and yellow evening primrose (Oenothera primiveris), Cabeza Prieta National Wildlife Refuge, Arizona. February 2014.

Jack Dykinga / Night blooming birdcage evening primrose (Oenothera deltoides) with the Sheep Hole Mountains in the background at sunset, BLM (Bureau of Land Management) land, Mojave Desert, California. March 2014.

Jack Dykinga / Birdcage evening primrose (Oenothera deltoides) and Desert sand verbena (Abronia villosa) flowering in desert, Pinta Sands, Sierra Pinta Mountains, Cabeza Prieta National Wildlife Refuge, Arizona, USA

Jack Dykinga / Birdcage evening primrose (Oenothera deltoides) growing in sand dunes, with beetle tracks in the sand, East Mojave Desert, California, USA

Jack Dykinga / Birdcage evening primrose (Oenothera deltoides) and Desert sand verbena (Abronia villosa) flowering in desert, Pinta Sands, Sierra Pinta Mountains, Cabeza Prieta National Wildlife Refuge, Arizona, USA

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

Jack Dykinga / Sand Verbena (Abronia villosa) and Birdcage Evening Primrose (Oenothera deltoides) flowering on Pinta Sands, Sierra Pinta Mtns, Cabeza Prieta NW Refuge, Arizona, USA

Jack Dykinga / Sand Verbena (Abronia villosa) and Birdcage Evening Primrose (Oenothera deltoides) flowering on Pinta Sands, Sierra Pinta Mtns, Cabeza Prieta NW Refuge, Arizona, USA

Jack Dykinga / Cardon Cactus (Pachycereus pringlei) and Galloping Cactus (Machaerocereus gummosus) amongst flowering Evening Primrose (Oenthera sp), Vizcaino Desert, Baja California Sur, Mexico, Central America

Jack Dykinga / Sand Verbena (Abronia villosa) and Evening Primrose (Oenothera sp) flowering beneath a Galloping Cactus (Stenocereus gummosus) Vizcaino Desert, Baja California Sur, Mexico, Central America

Claudio Contreras / Evening primrose (Oenothera deltoides), Sand verbena (Abronia villosa) and Snowy sunflower (Helianthus niveus) in sand dune at dawn. Sierra El Rosario mountain range in background. El Pinacate Biosphe...

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....

Jack Dykinga / Birdcage evening primrose (Oenothera deltoides) and desert golds (Geraea canescens) carpet the sandy washes beneath the Calumet Mountains at dawn. Mojave Trail National Monument, Mojave Desert, Califo...

Jack Dykinga / Mojave Desert with the Sheephole Mountains in the background, and birdcage evening primrose (Oenothera deltoides) in the forground. Mojave Trail National Monument, California, USA. 27th March 2019.

Jack Dykinga / Night-blooming birdcage evening primrose (Oenothera deltoides) flowers, opened for moth polination at dawn. With Joshua Tree Wilderness and Joshua Tree National Park's Coxcomb Mountains in the bac...

Jack Dykinga / Night-blooming birdcage evening primrose (Oenothera deltoides) opened for moth polination, under the Milky Way. Mojave Desert, with Joshua Tree Wilderness and Joshua Tree National Park's Coxcomb M...

Kerstin Hinze / Male Bullfinch (Pyrrhula pyrrhula) feeding on Evening primrose seeds (Oenothera), Lower Saxony, Germany, December.

Jack Dykinga / Birdcage evening primrose (Oenothera deltoides) flowering in the sand dune flats near Joshua Tree National Park, California, USA, March.

Jack Dykinga / Birdcage evening primrose (Oenothera deltoides) flowering in the sand dune flats near Joshua Tree National Park, California, USA, March.

Jack Dykinga / Birdcage evening primrose (Oenothera deltoides) flowering in the sand dune flats near Joshua Tree National Park, California, USA, March.

Fabrice Cahez / Slug (Limax maximus) on Common evening-primrose (Oenothera biennis) flower, Vosges, France, July.

Jack Dykinga / Whipple Mountain foothills, with sheets of color from blooming Heliotrope Phacelia (Phacelia crenulata) (purple) and Heartleaf evening primrose (Camissonia cardiophylla) with the Riverside and Big Mar...

Jack Dykinga / Whipple Mountain foothills, with sheets of color from blooming Heliotrope Phacelia (Phacelia crenulata) (purple) and Heartleaf evening primrose (Camissonia cardiophylla) with the Riverside and Big Mar...

Jack Dykinga / Joshua Tree National Park under the Milky Way, with night flowering Birdcage evening primrose (Oenthera deltoides) dotting the sandy flats. California, USA, March 2017.

Jack Dykinga / Joshua Tree National Park under the Milky Way, with night flowering Birdcage evening primrose (Oenthera deltoides) dotting the sandy flats. California, USA, March.

Fabrice Cahez / Evening-primrose (Oenothera biennis) flower, Vosges, France, July.

Ingo Arndt / Common evening primrose flowers {Oenothera biennis} Germany

Jack Dykinga / Desert landscape with flowering Sand verbena (Abronia), Desert gold (Geraea canescens), and Birdcage evening primrose (Oenothera deltoides) Anza-Borrego State Park, California, USA. March 2017. These...

Jack Dykinga / Whipple Mountain foothills, with mass bloom of Notch-leaf scorpion-weed (Phacelia crenula) and Heartleaf evening primrose (Camissonia cardiophylla) Whipple Mountain Wilderness in background, Sonoran D...

Jack Dykinga / Birdcage evening primrose (Oenothera deltoides) flowers on sand dunes at sunset with Ship Mountains in background. Mojave Trails National Monument, California, USA.

Jack Dykinga / Birdcage evening primrose (Oenothera deltoides) in flower next to skeleton of remnant dried plant. Mojave Trails National Monument, California, USA.

Floris van Breugel / Sand verbena (Abronia villosa) and Brown-eyed evening primrose (Camissonia claviformis) blooming in sand dunes, during super bloom caused by El Nino weather Death Valley, California, USA. March 2016.

Floris van Breugel / Flowers blooming in Death Valley including Phacelia (Phacelia crenulata), Desert gold (Geraea canescens), Rock daisies (Perityle emori), and Brown-eyed evening primrose (Camissonia claviformis) during...

Jeff Foott / Dune Evening Primrose (Oenothera deltoides) in desert, Mojave Desert, California

Jeff Foott / Dune Evening Primrose (Oenothera deltoides) in desert, Mojave Desert, California

Jeff Foott / Desert Sand Verbena (Abronia villosa) and Dune Evening Primrose (Oenothera deltoides) in desert, Mojave Desert, California

Jeff Foott / Desert Sand Verbena (Abronia villosa) and Dune Evening Primrose (Oenothera deltoides) on sand dune at night, Mojave Desert, California

Claudio Contreras / Pink evening primrose (Oenothera speciosa) stamens Laredo Borderlands, Texas, USA. April

Claudio Contreras / Pink evening primrose (Oenothera speciosa) Laredo Borderlands, Texas, USA. April

David Woodfall / Mixture of flowering plants including evening primrose (Oenothera biennis) planted to attract bees in formerly derelict land surrounding Olympic stadium. Queen Elizabeth Olympic Park, Stratford, Londo...

Jack Dykinga / White flowering birdcage evening primrose (Oenothera deltoides) and Coulter's globemallow (Sphaeralcea coulteri), Cabeza Prieta National Wildlife Refuge, Arizona. February 2014.

Jack Dykinga / White flowering birdcage evening primrose (Oenothera deltoides), yellow evening primrose (Oenothera primiveris) and Coulter's globemallow (Sphaeralcea coulteri) with the Sierra Pinta Mountains in the...

Ross Hoddinott / Cowslip (Primula veris) flowers backlit in evening light, Devon, UK, May 2012.

Loic Poidevin / Floating primrose-willow (Ludwigia peploides), Marais breton, Britany / Bretagne, France, July.

Loic Poidevin / Floating primrose-willow (Ludwigia peploides), Marais breton, Brittany / Bretagne, France, July.

Nick Upton / Great willowherb (Epilobium hirsutum) flowering in a ditch with a herd of Bullocks (Bos taurus) in the background, Gloucestershire, UK, July.

Nick Upton / Great willowherb (Epilobium hirsutum) flowering in a ditch with a herd of Bullocks (Bos taurus) in the background, Gloucestershire, UK, July.

Adrian Davies / Dock (Rumex sp) seeds in autumn, and Greater Willowherb (Epilobium hirsutum) Surrey, England, UK, September.

Adrian Davies / Evening Primrose (Oenothera sp) flower opening in evening - three exposures over 20 minutes. Surrey, England.

Tim Fitzharris / White Evening Primrose (Oenothera caespitosa) flowers, Texas

Ernie Janes / Evening primrose (Oenothera erythrosepala) flowering next to Rosebay Willowherb, Norfolk, UK July

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

Wild Wonders of Europe / Préau / Evening primrose (Oenothera sp) flowering in industrial area, Grande-Synthe, Dunkirk, France, September 2010

Andy Sands / Sloe Bug (Dolycoris baccarum) on petal of evening primrose after shower of rain. Hertfordshire, England, UK, July.

Roger Powell / Fragrant / Tufted evening-primrose (Oenothera caespitosa) flower growing wild on sand dunes, The Raven Nature Reserve, Wexford, Republic of Ireland, June

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

Wild Wonders of Europe / Benvie / Evening primose (Oenothera sp) flowering in dunes, Huelva, Spain, April 2009

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 Laman / Desert sand verbena (Abronia villosa) and Dune evening primrose (Oenothera deltoides) Anza-Borrego Desert State Park, California. Mar 2004.

Tim Laman / Desert sand verbena (Abronia villosa) and Dune evening primrose (Oenothera deltoides) Anza-Borrego Desert State Park, California. Mar 2004.

Jan Vermeer / European Goldfinch (Carduelis carduelis) on withered Large-flowered Evening Primrose (Oenothera erythrosepala), Harderwijk, Netherlands

Hanne & Jens Eriksen / Lesser spotted woodpecker {Picoides / Dendrocopos minor} feeding in Evening primrose flower, Poland

Jack Dykinga / Dawn light over petrified sand dunes, with snowball sand verbena (Abronia fragrans) and prairie evening primrose (Oenothera albicaulis). Vermilion Cliffs National Monument, Arizona

Jack Dykinga / Sand Verbena (Abronia villosa) and Birdcage Evening Primrose (Oenothera deltoides) flowering amongst dune patterns on Pinta Sands, Sierra Pinta Mtns, Cabeza Prieta NW Refuge, Arizona, USA

Jack Dykinga / Sand Verbena (Abronia villosa), Desert Club Cholla (Opuntia kunzei) and Birdcage Evening Primrose (Oenothera deltoides) flowering on Pinta Sands at dawn, Sierra Pinta Mtns, Cabeza Prieta NW Refuge, Ar...

Jack Dykinga / Cardon Cactus (Pachycereus pringlei) and Cholla Cactus (Opuntia cholla) amongst flowering Evening Primrose (Oenthera sp), Vizcaino Desert, Baja California Sur, Mexico, Central America

Jack Dykinga / Sand Verbena (Abronia villosa) and Birdcage Evening Primrose (Oenothera deltoides) flowering amongst dune patterns on Pinta Sands, Sierra Pinta Mtns, Cabeza Prieta NW Refuge, Arizona, USA

Jack Dykinga / Evening Primrose (Oenthera sp) flowers amid a Cholla Cactus (Opuntia cholla) skeleton, Vizcaino Desert, Baja California Sur, Mexico, Central America

PREMAPHOTOS / White-lined sphinx moth / Striped hawkmoth (Hyles lineata) feeding at dusk on an Evening primrose flower, Utah, USA

Jack Dykinga / Birdcage Evening Primrose (Oenothera deltoides) in flower, Joshua Tree National Park, California

Philippe Clement / Large-flowered evening-primrose (Oenothera glazioviana), La Brenne, France

Jack Dykinga / Birdcage evening primrose {Oenothera deltoides}, Sand sunflowers {Helianthus niveus} and Sand verbena {Abronia villosa} flowering on sand dunes, Pinacate and Gran Desierto Altar Biosphere Reserve, Son...

Jack Dykinga / Birdcage evening primrose {Oenothera deltoides}, Sand sunflowers {Helianthus niveus} and Sand verbena {Abronia villosa} flowering on sand dunes, Pinacate and Gran Desierto Altar Biosphere Reserve, Son...