Oreocereus ritteri Cullmann 1958

Plants shrubby, usually branching basally to form clumps 1-1.5 m (3.3-4.9 ft) high and 2-4 m (6.6-13 ft) wide. Stems cylindrical, gray-green to dark green, 1-2 m (3.3-6.6 ft) long, 7-10 cm (2.8-3.9 in) in diameter. Ribs 12-14, notched deeply between areoles. Areoles bearing spines and many dense white hairs. Central spines 1-2, erect, straight to bent slightly downward, bright yellow to orange-yellow, 2-10 cm (0.8-3.9 in) long. Radial spines as many as 10, radiating, whitish with dark tips, to 2 cm (0.8 in) long. Flowers borne obliquely, red, to 11 cm (4.3 in) long and 5 cm (2 in) in diameter. Fruits globose, yellowish green, 3-5 cm (1.2-2 in) in diameter. Distribution: Ayacucho, Peru.

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