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.

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

Daniel Heuclin / Yellow Palo Verde / Foothill Palo Verde (Parkinsonia microphylla / Cercidium microphyllum) growing in habitat. Foothills of Santa Catalina mountains. Arizona, USA, September.

Martin Gabriel / Palo verde shrubs (Parkinsonia aculeata) in limestone hills, Palo Verde National Park, Costa Rica, February 2009

Martin Gabriel / Palo verde shrubs (Parkinsonia aculeata) growing in limestone hills, Palo Verde National Park, Costa Rica, February 2009

Tim Fitzharris / Palo Verde Tree (Parkinsonia sp) in desert, Saguaro National Park, Arizona