Plants treelike, tall, with open branching and trunks to 30 cm (12 in) in diameter. Stem segments very large, obovate, firm, hard, yellowish green, becoming dark green, glossy, often wavy, 35-55 cm (14-22 in) wide. Areoles small, close set. Glochids to 1 mm long. Spine usually one, sometimes 2-4, sometimes absent, short, white, erect, sometimes twisted, 1-1.5 cm (0.4-0.6 in) long. Flowers creamy white. Fruits red with orange tint, 9-10 cm (3.5-3.9 in) long, 4-5 cm (1.6-2 in) in diameter. Distribution: probably native to Aguas-calientes, Mexico, but Opuntia undulata is widely cultivated.
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