Peniocereus striatus

Peniocereus striatus is a species of cactus known by several common names, including gearstem cactus, cardoncillo, jacamatraca, sacamatraca, and dahlia-rooted cactus. It is endemic to the Sonoran Desert, where it occurs in Baja California, Sinaloa, and Sonora in Mexico and Arizona in the United States. This cactus is a shrub with narrow brown or greenish cylindrical branching stems up to a meter long, but known to reach 2 meters at times. When not in flower or fruit the plant is "very inconspicuous", and "commonly looking more like a collection of dead stems" hidden amongst the dry branches of other plants. The stems are covered in clusters of small, weak spines a few millimeters long. They are yellowish white, sometimes with black tips. The roots have tuber-like swellings at their tips that resemble sweet potatoes. The flowers bloom at night. They are up to 10 centimeters wide with white or pinkish inner tepals and reddish or purplish outer tepals. The style is up to 6 centimeters lon......read more on Wikipedia.