Selenicereus costaricensis, synonym Hylocereus costaricensis, known as the Costa Rican pitahaya or Costa Rica nightblooming cactus, is a cactus species native to Central America and north-eastern South America. The species is grown commercially for its fruit, called pitaya or pitahaya, but is also an impressive ornamental vine with huge flowers. The species may not be distinct from Selenicereus monacanthus.
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Selenicereus monacanthus in the context of Selenicereus megalanthus
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 skinned fruit of S. megalanthus has thorns, unlike the green, red or yellow skinned dragon fruits of S. undatus, S. monacanthus and their cultivated hybrids. S. megalanthus is commonly known as "yellow dragon fruit", "yellow pitahaya", "kirin fruit", or "yellow pitaya". This name leads at times to confusion, as unrelated cultivars of other dragonfruit species can also have yellow skinned fruit. One example of a yellow dragonfruit cultivar not related to S. megalanthus is 'Australian Gold'.