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

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