Nightblooming cereus
Peniocereus greggii
Nightblooming cereus is also known as “Arizona queen of the night” and “Reina de la noche.”
I’ve only seen this cactus once but apparently this cactus likes to grow underneath ironwood, creosote, and other bushes making it’s few, thin, stems hard to spot.
Nightblooming cereus is most famous for its white, cream, or pinkish strongly scented flowers. The flowers bloom after dark sometime in June or July and wither by morning.