Border Pinyon growing on a rocky canyon slope in the Santa Catalina Mountains, Arizona. Photo: Wikimedia Commons (CC BY 2.0) Pinus discolor, commonly known as
Bonpland Willows, known as “ahuejote” in Mexico, growing in their characteristic tall, narrow form along a canal. Photo: Wikimedia Commons (CC BY 2.0) Salix bonplandiana,
A note on photos: Arizona Alder is poorly represented in open-licensed photo archives. No Wikimedia Commons image of this species currently meets our sourcing standards
Prairie flameleaf sumac lights up limestone hillsides with scarlet and orange foliage every autumn. Photo: Mike Tilley, Wikimedia Commons (CC BY 4.0) Rhus lanceolata, commonly
Fremont silktassel’s drooping, silky catkins give the plant both its common name and its winter interest. Photo: A. Barra, Wikimedia Commons (CC BY 3.0) Garrya
A mature drooping juniper showing the strongly weeping branch habit found in no other North American juniper. Photo: annikaml, Wikimedia Commons (CC BY 4.0) Juniperus
A mature Chihuahua pine with its characteristic open, twin-leadered crown. Photo: Wikimedia Commons (CC BY 3.0) Pinus leiophylla, commonly known as Chihuahua Pine or smooth-leaf
Sand Post Oak’s glossy, cross-shaped leaves, photographed in South Carolina. Photo: Bruce Kirchoff, Wikimedia Commons (CC BY 2.0) Quercus margarettae (also spelled Q. margaretta), commonly
Knowlton Hophornbeam growing on a sunny canyon rim in the Grand Canyon, one of its classic habitats. Photo: Rosie Yacoub, iNaturalist/Wikimedia Commons (CC BY 4.0)
Quercus graciliformis, known as the Chisos Oak or Slender Oak, is one of the rarest trees native to the United States. It exists nowhere in
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