cereus

Any of various large cacti (genus and related genera) of the western U.S. and tropical New World, including the saguaro and the organ-pipe cactus (, also or ). The genus (night-blooming cereus, or moon cactus), containing about 20 species, is known for its large, usually fragrant, night-blooming white flowers, among the largest in the cactus family. The queen-of-the–night (), the best-known night-blooming cereus, is often grown indoors.

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