Psorothamnus spinosus, or Delea spinosa, is a perennial legume tree of the deserts in North America. Common names include smokethorn, smoketree, smoke tree, smokethorn dalea, and corona de Cristo.

Quick Facts Psorothamnus spinosus, Scientific classification ...

Psorothamnus spinosus
Mature form: 3–5 m
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Fabales
Family:	Fabaceae
Subfamily:	Faboideae
Genus:	Psorothamnus
Species:	P. spinosus
Binomial name
Psorothamnus spinosus (A.Gray) Barneby
Natural distribution range
Synonyms
Dalea spinosa

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P. Spinosus is native to the desert washes in the Colorado Desert in Southern California, the Sonoran Desert in western Arizona, and most of eastern Baja California state including several northern Gulf of California (Sea of Cortez) islands,^[1] The tree is common in Joshua Tree National Park, where it is called the smoketree.

The range of P. spinosus is centered north-south along the Lower Colorado River Valley ranging northwest into the eastern Mojave Desert, west into mostly all of the Colorado Desert-(subsection of Sonoran Desert), and east of the Colorado River in southwestern Arizona's Sonoran Desert.^[1]

To the west in Baja California it borders the western Gulf of California; it occurs on the islands there including Isla Ángel de la Guarda, but not Tiburon Island.^[1] To the east in Sonora, the species ranges into the northwest of the great Gran Desierto de Altar, on the northern shore of the Gulf of California.

In Arizona, the RangeMap also shows that the ranges center on the river courses of southwest Arizona, specifically, the Bill Williams River in the north, then the Gila River^[1] in the south. The range also extends into extreme southern Nevada, mostly adjacent the Colorado River.^[1]