Selenicereus megalanthus, synonym Hylocereus megalanthus, is a cactus species in the genus Selenicereus that is native to northern South America, where it is known, along with its fruit, by the name of pitahaya. The species is grown commercially for its yellow fruit, but is also an impressive ornamental climbing vine with perhaps the largest flowers of all cacti. The yellow fruit has thorns, unlike the red dragon fruits (e.g. S. undatus and S. monacanthus), and is commonly known as "yellow dragon fruit", "yellow pitahaya", "kirin fruit", or "yellow pitaya".