Echinopsis pachanoi f. cristata (Crested San Pedro Cactus) is a rare, crested form of Echinopsis pachanoi. The stem is fan-shaped, pale to…
The characteristic crested shape can also be very large, which makes it a spectacular specimen.
The stems, in the form of a fan, bluish green or pale green to dark, forming over time imposing mounds similar to brains up to one meter in diameter and height.
The ribs, broad at the base, obtuse, rounded, with a deep horizontal depression on the areola.
The Areola, whitish, closed set.
Thorns are often missing, when they are present, they are about 3 to 7, uneven, only a few millimeters long, from dark yellow to light brown.
The spines are found in the nodules and are evenly spaced (1 to 2 cm apart) along the ribs.
Flowers: very large, white, at night and open for the next day, fragrant, up to 22 cm in diameter. They bloom in July.
The fruits are oblong, dark green, about 5-6 cm long, and about 3 cm in diameter.
Echinopsis pachanoi (syn. Trichocereus pachanoi) — known as San Pedro cactus — is a fast-growing columnar cactus native to the Andes Mountains at 2,000–3,000 m (6,600–9,800 ft) in altitude.   It is found in Argentina, Bolivia, Chile, Ecuador and Peru,  and it is cultivated in other parts of the world. Uses for it include traditional medicine and traditional veterinary medicine, and it is widely grown as an ornamental cactus. It has been used for healing and religious divination in the Andes Mountains region for over 3,000 years.  It is sometimes confused with its close relative Echinopsis peruviana (Peruvian torch cactus).
Trichocereus pachanoi Britton & Rose