Castela emoryi (A.Gray) Moran & Felger

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Castela emoryi, with the common names crucifixion thorn, Emory's crucifixion-thorn, and Spanish: chaparro amargosa, is a shrub species in the genus Castela of the family Simaroubaceae.

The plant is native to the Mojave Desert and Sonoran Deserts of North America.

It is found in southern California, Arizona, and Sonora state (México).

The species is dioecious and occurs in the moistest areas in the hottest, driest deserts within its range; it is considered poor in germination.

Castela emoryi is often less than 1 metre (3.3 ft), and occasionally to grows 4 metres (13 ft) or more.

Crucifixion thorn is mostly leafless, its sharp branches are green and perform photosynthesis. Seeds are contained in clusters of fruit in groups of 5. The fruit is tan, green, red or brown in color, turning black with age. and may persist on the tree for several years.

It is ranked on the California Native Plant Society Inventory of Rare and Endangered Plants, as an endangered species within California, and more common elsewhere. It is threatened by solar energy development and military activities within its California range. The species is classified as "Salvage restricted" in Arizona.

Castela emoryi - Wikipedia

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