Arizona's only night-blooming cereus looks like a withered grayish-green stick, up to 1" thick and several feet long.  Old plants have several branches.  Since it grows under creosotes, palo verdes, ironwoods, and other desert trees that it needs for shelter and support, it is practically invisible for most of the year.
All plants in an area bloom on a single night.  Huge 2-6 inch flowers open at sunset and are pollinated by the
White-lined Sphinx Moth, Celerio lineata.  Large red fruits ripen in autumn.