Corryocactus brevistylus

This species reaches 2 to 5 meters in height with erect, dark to yellowish-green stems that are 12 to 15 cm in diameter. Its prominent feature is its 6 to 8 well-defined ribs, each bearing large, circular, raised areoles. Initially orange-brown, these areoles mature to gray and are spaced 2 to 4 cm apart. The spines are needle-shaped and uniform, lacking clear differentiation into central and radial types. They are typically yellow to reddish-brown, fading with age, and number around 15 per areole. Shorter spines on the periphery range from 0.3 to 3 cm, while the 2 to 4 central spines are significantly longer, measuring 4 to 10 cm but potentially up to 24 cm. Its funnel-shaped, yellow flowers, measuring 8 to 11 cm long and up to 10 cm in diameter, bloom during the day and are odorless. They emerge laterally on the stems and feature a floral tube densely covered with narrow, grayish-green scales and grayish felt. The flowers have inward-bent stamens, short styles, and a highly branched stigma. The fruits are large, round, and yellowish-green, with a diameter of 7 to 10 cm. Initially covered in numerous spines that are shed upon ripening, they contain a juicy pulp with oval, brown seeds.

Corryocactus brevistylus is a shrubby cactus native to the inter-Andean valleys of southern Peru and northern Chile, thriving in desert and dry scrubland biomes. It prefers arid, stony, sandy, and rocky hillsides between 2,000 and 3,600 meters in elevation, tolerating minimal water and moisture, and temperatures below 10°C. The fruits are a food source for guanacos, aiding in seed dispersal. Tillandsia usneoides (Spanish moss) can grow on Corryocactus brevistylus. While not parasitic, it can shade the cactus, potentially reducing fruit production.