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Peniocereus greggii
''Peniocereus greggii'' is a cactus species native to Arizona, New Mexico, Texas (USA); and Chihuahua, Coahuila, Durango, Sonora, and Zacatecas (Mexico).〔(Flora of North America - Peniocereus greggii )〕 Common names include Arizona queen of the night, nightblooming cereus and Reina de la noche. The species name greggii honors Josiah Gregg (1806 – 1850), a merchant, explorer, naturalist, and author of the American Southwest and Northern Mexico.
==Description==
This cactus has stems about 1/2-1 inch wide with 6-9 edges. Its flowers are white, up to 30 centimetres in diameter with a scent redolent of vanilla. The flowers open after sundown, closing and wasting after a few hours. By 9 am the next day they are gone.
They usually bloom one night a year in June or July. In any given area, they all bloom at the same time. They look dead during the rest of the year. They have a large tuber that tastes a bit like a potato. They tend to be ubiquitous throughout the higher sonoran desert area around Tucson. See "A Natural History of the Sonoran Desert published by the Arizona Sonora Desert Museum, pg 197.
Tohono Chul in Tucson, Arizona 〔http://tohonochul.org〕 has the largest private collection of Sonoran Desert native Night-blooming Cereus - ''Peniocereus greggii''. Each summer this botanical garden/museum hosts "Bloom Night," the one night each summer it is predicted the greatest number of cereus flowers will be in bloom, opening from 6pm until midnight to allow guests to stroll the grounds and view the flowers.〔http://bloomwatch.org〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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