Arizona queen of the night, Peniocereus greggii

The Arizona Queen of the Night is a cactus originally from Arizona (USA) and Sonora (Mexico). It is also known as the night blooming cereus or Reina de la noche (Latin Peniocereus greggii, also called Cereus greggii)

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.