The flower of the dragon fruit only blooms after dark. Although more commonly found in Southeast Asia, this photo was taken at the Banyan Tree Sanctuary in Kailua Kona on the island of Hawaii.
This plant (latin name pitya) has a flower that looks like an explosion of flame and produces a beautiful but short-lived fruit with the appearance of a brilliant red rosebud. Dragon fruit is purported to have many health benefits.
I can tell you that it tastes delicious!