Peniocereus greggii is a cactus species native to Arizona, New Mexico, Texas (USA); and Chihuahua, Coahuila, Durango, Sonora, and Zacatecas (Mexico). 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.
(Wikipedia)