They have large pure white star-like flowers with lovely fragrance to help their pollinators locate the blossoms by moon or star light.
The flower starts blooming after sunset from 7 p m onwards and takes about two hours to full bloom,about 8 inches in diameter and remain open through out night.
Brahma Kamal, named after Brahma, the God of Creation, probably blooms only for one night in the entire year, somewhere between July and September.
It is commonly known as Night blooming Cereus, Queen of the night, Lady of the night as its beautiful Lotus like flower blooms late night. In India it is called as Brahma Kamal ( ब्रह्मकमल ) and is treated as a sacred plant.
It is also popularly known as Orchid Cactus as the flower has orchid like beauty and plant resembles cactus in habit.The Brahma Kamal plant found in Himalayas is often mixed with the plant seen growing on window sill in homes. It is the state flower of Uttarakhand.