Discocactus catingicola

The stem is flattened-globular, measuring 3 to 9 cm (1.2 to 3.5 in) tall and 8 to 20 cm (3.1 to 7.9 in) in diameter, with a dark olive-green epidermis and branched roots. It features 9 to 13 well-defined ribs that are arranged vertically or slightly spirally and divided into non-flattened tubercles. 3-6 Oval to elongated areoles per rib are sunken on these tubercles, each bearing spines. The spines are yellow to gray, sometimes with darker bands, and can be straight or slightly curved. They typically consist of a single central spine 0.8 to 2 cm (0.31 to 0.79 in), sometimes absent and 3 to 10 radial spines that are 0.2 to 3.6 cm (0.079 to 1.417 in) long. Adult plants develop a woolly cephalium at their apex, measuring 2 to 7.5 cm (0.79 to 2.95 in) in height and 0.5 to 4.5 cm (0.20 to 1.77 in) in diameter. This structure, composed of white wool with occasional gray or black bristles that are 1.5 to 5 cm (0.59 to 1.97 in), protects the plant from cold and intense UV radiation, and is believed to attract pollinators. The fragrant, white, tubular flowers emerge from the cephalium's edge, opening at night and pollinated by moths. They measure 4.8 to 7 cm (1.9 to 2.8 in) long and 3.5 to 6 cm (1.4 to 2.4 in) in diameter, with olive-green buds. The floral tube is thin and white with light olive-green tips, bearing fleshy scales. …

Discocactus catingicola is a small, solitary cactus native to eastern Goiás and central Bahia in Brazil. It is found growing in seasonally dry tropical biomes, typically near rivers on exposed sandy or rocky soils, at elevations of 450 to 700 meters.