H. polyrhizus) has red-skinned fruit with red flesh Hylocereus megalanthus (yellow pitaya, formerly in Selenicereus) has yellow-skinned fruit with white flesh.  Native to  Mexico  and  Central  and  Sout h America , the vine-like  epiphytic   Hylocereus cacti are also cultivated in  Asian  countries such as Taiwan ,  Vietnam ,  Thailand , the