Template:Leuenberger, 1993

• Leuenberger, B.E. 1993. Interpretation and typification of Cactus opuntia L., Opuntia vulgaris Mill., and O. humifusa (Rafin.) Rafin. (Cactaceae). Taxon 42(2): 419–429. DOI: 10.2307/1223152 Wiley  
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