Crucifixion Thorn

Aptly named for its cross-shaped spines. Also known as castela, corona-de-Cristo, rosario. A large shrub that can grow to 12'. Named for its grayish green, smooth rigid twigs, up to 8" long and about 1/4" in diameter that are tipped by sharp spines.

Blooms during June and July.
Has male and female flowers on separate plants; female flowers followed by a ring composed of 5-10 flattened 1-seeded segments which can survive for years.
Found at 500 to 2,000' elevation.
Plants are native mostly to the southwestern part of Arizona and are less common in the foothills area.