Opuntia insularis A Stewart 1911

Plants shrubby to treelike, 1-2.5 m (3.3-8.2 ft) high with poorly developed trunks. Stem segments round, obovate, or oblong, green to greenish yellow, 10-52 cm (3.9-20 in) long, 18-25 cm (7.1-9.8 in) wide, 0.5-2.5 cm (0.2-1 in) thick. Areoles whitish, 4-7 mm (to 0.3 in) in diameter, 14-18 mm (0.6-0.7 in) apart. Glochids yellow, 4-6 mm (0.2 in) long. Spines 10-50, nearly equal in length, evenly distributed, yellow, becoming reddish or dark brown with age, some sharp, others bristly, 1-2 cm (0.4-0.8 in) long with some to 5 cm (2 in) long. Flowers poorly known, probably yellow. Fruits globose, green, 2-4.2 cm (0.8-1.7 in) long, 2-3 cm (0.8-1.2 in) in diameter, with small spines and glochids. Distribution: Fernandina (Narborough) and Islabela (Albemarle) Islands in the Galápagos archipelago.

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