http://www.codexalimentarius.org/download/standards/316/CXS_185e.pdf CODEX STAN 185-1993Standard for Nopal This Standard applies to modified stem of commercial varieties of nopals grown from Opuntia ficus indica, O. tomentosa, O. hyptiacantha, O. robusta, O. inermis, O. ondulata, of the Cactaceae family
http://www.codexalimentarius.org/download/standards/317/CXS_186e.pdf CODEX STAN 186-1993Standard for Prickly Pear "This Standard applies to the fruit of commercial varieties of prickly pears grown from Opuntia ficus indica, O. streptachanthae, and O. lindheimeiri, of the Cactaceae family"