| Sumario: | Revision of the Argentine Cactaceae. The autor corrects the name Echinopsis oreopogon for E. oreopepon as it was denominated, establishes a nov. nom. Gymnocalycium astertum for G. stellatum, records Pereskia aculeata and Phyllocactus oxypetalus as new species of the Argentine flora, studies Cereus lamprochlorus var. salinicola Speg., Opuntia sulphurea Gill. In Don emend. Schum., O. maculacantha Foerst., O. pampeana Speg- and gives the keys to distinguish the sections and subsections of the subgenus Platyopuntia with the respective list of the species belonging to the Argentine flora.
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