Plants shrubby, erect and with open branching, 1.5-2 m (4.96.6 ft) high. Stem segments obovate, dark green, slightly pubescent, 14-24 cm (5.5-9.4 in) long, to 16 cm (6.3 in) wide. Areoles small, dark yellow. Glochids yellow, less than 2 mm long. Spines 2-3 at first, later 4-5, whitish at first, later darker, erect, slightly flattened, often twisted, 5-35 mm (0.2-1.4 in) long. Flowers not known. Fruits subglobose, yellowish to reddish, pubescent. Distribution: Zacatecas, Mexico.
Plants prostrate or scrambling, often forming dense clumps 0.7-2 m (2.3-6.6 ft) high. Trunks usually absent. Stem segments round, oblong, or ovate, yellowish green, 20-37 cm (7.9-15 in) long, 10-22 cm (3.9-8.7 in) wide, 1.3-2.6 cm (0.5-1 in) thick. Glochids yellow, 2-6 mm (to 0.2 in) long, sometimes absent. Spines 7-28, bristly, not dimorphic, not sharp, evenly distributed, spreading, flexible, variable in length, sometimes wavy, yellowish white, becoming darker with age, 1.2-5 cm (0.5-2 in) long. Flowers yellow, 4-8 cm (1.6-3.1 in) long, 3-5.5 cm (1.2-2.2 in) in diameter. Fruits globose to oblong, green, 4-7 cm (1.6-2.8 in) long, 2-4 cm (0.8-1.6 in) in diameter, with small spines and glochids. Dis
tribution: Darwin, Genovesa (Tower), Marchena (Bindloe), and Wolf Islands in the Galápagos archipelago.
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