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Hedge cactus (Cereus repandus).

Tree-like cactus, up to 33 feet tall (10 m); segmented stems, 4 to 8 inches in diameter (10 to 20 cm); 9 or 10 rounded ribs; very variable spination. White with pinkish-red petal tips, 6 inches in diameter (15 cm) flowers. They are followed with red fruit, 2.5 inches long (4 cm), with white pulp.

If you want more information about this flower, just search the plant's Latin name on Google:

Echinopsis cactus