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From: Mountain View, CA
Region: California
Topic: Seed and Plant Sources
Title: Identification of night blooming Cereus
Answered by: Jimmy Mills
Peniocereus Peniocereus greggii (nightblooming cereus) is native to southern Arizona, New Mexico and southwest Texas (see photo). It is listed as an endangered plant in New Mexico, and as salvage restricted (collect only with a permit) in Arizona. It is considered a vanishing plant throughout its range due to activities of collectors. Click here for more details.
Since you didn't mention cactus in your question, your Grandmother may have been growing a very "non-cactus" looking plant Epiphyllum oxypetalum. This plant is native to Central America and grows as an epiphyte in the jungle (see photo). It has many enthusiasts among plant hobbyists. The San Diego Epiphyllum Society's web page can give you more information about obtaining and caring for your own nightblooming cereus.
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