United States, Arizona, Pima County, Organ Pipe Cactus National Monument; Puerto Blanco Mountains.
32.0045 -112.8579 +-20000m.
518 metros
1700 ft.
Flowers nocturnal, opening shortly after sunset and closing the followiong morning, then fully expanded 7 to 8 cm. long and with the free segments strongly recurved, inner perianth segments pinkish-lavender with white margin and base, scales of the hypanthium purplish-red.