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Echinocereus triglochidiatus "White Sands" SB1598 MG 260.9 5/27/17
The flowers stay open night and day for several days. This cultivar lives in White Sands National Monument, where it grows to more than 3 feet (1 m) tall. I’m pretty sure that the species is hardy to -20 F, or lower (-29 C) (30/48)