Jack Dykinga / Saguaro cacti (Carnegiea gigantea) in bloom with Foothill paloverde (Cercidium microphyllum) Sonoran Desert National Monument, Arizona, USA, April.

Jack Dykinga / Yellow paloverde (Cercidium microphyllum) flowering amongst Saguaro (Carnegiea gigantea). In foothills on north side of Santa Catalina Mountains, Coronado National Forest, Arizona, USA. May 2019.

Jack Dykinga / Yellow paloverde (Cercidium microphyllum) flowering amongst Saguaro (Carnegiea gigantea). In foothills on north side of Santa Catalina Mountains, Coronado National Forest, Arizona, USA. May 2019.

Jouan Rius / Rainbow over Saguaro cacti (Carnegiea gigantea), Organ Pipe Cactus (Stenocereus thurberi) and Foothills Palo Verde tree (Cercidium microphyllum), Organ Pipe Cactus National Monument, Sonoran Desert, A...

Jouan Rius / Yellow or Foothills Palo Verde tree (Cercidium microphyllum), Arizona, USA. April 2014.

Cyril Ruoso / Black-chinned hummingbird (Archilochus alexandri) feeding on Foothill Palo verde (Cercidium / Parkinsonia microphyllum) nectar, Vizcaino Desert, Baja California, Mexico, May.

Cyril Ruoso / Black-chinned hummingbird (Archilochus alexandri) feeding on Foothill Palo verde (Cercidium / Parkinsonia microphyllum) nectar, Vizcaino Desert, Baja California, Mexico, May.

Gabriel Rojo / Flowers of Verde olivo (Parkinsonia praecox) Lihue Calel National Park, La Pampa, Argentina

Gabriel Rojo / Verde olivo tree (Parkinsonia praecox) in flower, Lihue Calel National Park, La Pampa, Argentina

Rolf Nussbaumer / Paloverde {Parkinsonia texana} flowers, Rio Grande Valley, Texas, USA, March

Rolf Nussbaumer / Greater Roadrunner (Geococcyx californianus)feeding Grasshopper to young in nest in Paloverde (Parkinsonia texana) shrub, Starr County, Rio Grande Valley, Texas, USA. May 2002

Rolf Nussbaumer / Greater Roadrunner (Geococcyx californianus) on nest in Paloverde (Parkinsonia texana) shrub with chick, Starr County, Rio Grande Valley, Texas, USA. May 2002

Rolf Nussbaumer / Greater Roadrunner (Geococcyx californianus) on nest in Paloverde (Parkinsonia texana) shrub, Starr County, Rio Grande Valley, Texas, USA. May 2002

Jack Dykinga / Saguaro {Carnegia gigantea}, Paloverde {Cercidium microphyllum} and Mesquite {Prosopis glandulosa} on cliffs of volcanic tuff, Hot Springs Canyon, Arizona, USA

Jack Dykinga / Saguaro cactus {Carnegia gigantea} flowering, Paloverde {Cercidium microphyllum} and Mesquite {Prosopis glandulosa} flowering on Bajada hillside, Hot Springs Canyon, Arizona, USA

Rolf Nussbaumer / Curve-billed Thrasher (Toxostoma curvirostre) on blooming Paloverde (Parkinsonia texana), Starr County, Rio Grande Valley, Texas, USA. April 2002

Michael & Patricia Fogden / Praying Mantis on Paloverde tree, Sonoran Desert, North America

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

Doug Wechsler / Sonoran desert stream with mixed cactus and paloverde community, Saguaro NP, Arizona

Michael & Patricia Fogden / Costa's Hummingbird (Calypte costae) female in nest in Paloverde tree, deserts of USA and Mexico

Jack Dykinga / Saguaro cacti (Carnegiea gigantea) in flower beside flowering Foothills paloverde (Parkinsonia microphylla), Santa Catalina Mountains, Arizona, USA, May 2023.

Jack Dykinga / Saguaro cacti (Carnegiea gigantea) in flower beside flowering Foothills paloverde (Parkinsonia microphylla), Santa Catalina Mountains, Arizona, USA, May 2023.

Tui De Roy / Galapagos doves (Zenaida galapagoensis) feeding on flowers of Parkinsonia shrub, Espanola Island, Galapagos Islands, Ecuador.

Jack Dykinga / Blue palo verde (Parkinsonia florida) tree with blue-green bark, covered in yellow flowers , Sonoran desert, Arizona, USA.

John Cancalosi / Great horned owl (Bubo virginianus) perched in Parkinsonia (Palo verde) tree, Sonoran Desert, Arizona, USA.

John Cancalosi / Cactus wren (Campylorhynchus brunneicapillus) on Saguaro cactus (Carnegiea gigantea) in bloom with Palo verde (Parkinsonia microphylla) in background, Sonoran desert, Arizona. Photo showing Arizona...