Echinopsis macrogona

Echinopsis macrogona, syn. Trichocereus macrogonus, is a species of cactus found in Bolivia. It has a shrubby habit, with erect columnar stems around 2–3 m (7–10 ft) tall and 5–9 cm (2.0–3.5 in) in diameter. The stem is bluish green with 6–9 prominent ribs. The gray colored areoles have yellow-brown spines; there are 1–3 longer central spines, up to 5 cm (2.0 in) long, and 6–9 shorter radial spines, up to 2 cm (0.8 in) long. Large white flowers, up to 18 cm (7.1 in) long, are borne at the top of the stems.