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.

Patricio Robles Gil / Cardon (Pachycereus pringlei) cactus and flowering Common Morning Glory (Ipomoea purpurea) vines in the Miquihuana Desert, northeast Mexico

Nigel Cattlin / Dragon fruit (Hylocereus undatus) on stall at food market, Bangkok, Thailand. 2015.

Jack Dykinga / Saguaro cactus (Carnegiea gigantea) blooming in early morning. Saturn, jupiter and milky way in night sky. Sonoran Desert National Monument, Arizona, USA. May 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...

Rolf Nussbaumer / Night-blooming cereus cactus (Acanthocereus tetragonus), flower bud opening at night, Texas, USA. Sequence 7 of 7. August

Rolf Nussbaumer / Night-blooming cereus cactus (Acanthocereus tetragonus), flower bud opening at night, Texas, USA. Sequence 6 of 7. August

Rolf Nussbaumer / Night-blooming cereus cactus (Acanthocereus tetragonus), flower bud opening at night, Texas, USA. Sequence 5 of 7 August

Rolf Nussbaumer / Night-blooming cereus cactus (Acanthocereus tetragonus), flower bud opening at night, Texas, USA. Sequence 4 of 7. August

Rolf Nussbaumer / Night-blooming cereus cactus (Acanthocereus tetragonus), flower bud opening at night, Texas, USA. Sequence 3 of 7 August

Rolf Nussbaumer / Night-blooming cereus cactus (Acanthocereus tetragonus), flower bud opening at night, Texas, USA. Sequence 2 of 7. August

Rolf Nussbaumer / Night-blooming cereus cactus (Acanthocereus tetragonus), flower bud opening at night, Texas, USA. Sequence 1 of 7. August

Cyril Ruoso / Cactus, unknown species, blooming by night in San Fernando reserve, Nazca Desert, Peru.

Gabriel Rojo / Cactus (Trichocereus candicans) in flower, the flowers of this species only open fully at night, Lihue Calel National Park, La Pampa, Argentina

Cyril Ruoso / Engelmann Prickly Pear (Opuntia engelmannii) cactus blooming at night, southern Texas

Cyril Ruoso / Yucca (Yucca torreyi) blooming at night, southern Texas

Cyril Ruoso / Old Man Cactus (Lophocereus schotti) at night with open flowers, El Vizcaino Biosphere Reserve, Mexico

Cyril Ruoso / Old Man Cactus (Lophocereus schottii) flower with ant on night blooming flower, El Vizcaino Biosphere Reserve, Mexico

Ingo Arndt / Fat Dormouse (Glis glis) adult in flowering tree, Europe

Pete Oxford / Surinam Passion Flower (Passiflora edulis) showing flower and fruit, South America

Michael & Patricia Fogden / Organ Pipe Cactus (Stenocereus thurberi) and flowering Paloverde in spring, Hermosillo, Sonoran Desert, Mexico

Michael & Patricia Fogden / Organ Pipe Cactus (Stenocereus thurberi) flowering in the Sonoran Desert, USA and Mexico

Larry Minden / Jimson Weed (Datura wrightii) night blooming, Grand Canyon, Arizona

Larry Minden / Jimson Weed (Datura wrightii) night blooming, Mojave Desert, California

Mark Moffett / Hoffmann's Two-toed Sloth (Choloepus hoffmanni) sleeping in flowering Shaving Brush Tree (Pseudobombax ellipticum), Panama

Paul Harcourt Davies / Evening primrose (Oenothera biennis) in flower, which open at night fall, Umbria, Italy. June.

Rolf Nussbaumer / Sphinx moth (Sphingidae) nectaring on Night-blooming cereus (Acanthocereus tetragonus) at night. Hill Country, Texas, USA.

Rolf Nussbaumer / Night-blooming cereus (Acanthocereus tetragonus) flowering at night. Hill Country, Texas, USA.