More images of ▶ argentine saguaro atacamensis big blue sky cactus cardon cardon grande cactus cardón echinopsis echinopsis atacamensis echinopsis terscheckii large noroeste argentino saguaro terscheckii
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Cardon Cactus - Echinopsis

I believe this is Echinopsis atacamensis or Echinopsis atacamensis.

These tree-size cactus are growing in the High Desert in North-West Argentina, Chile and Bolivia.­ I saw this one near Cachi (Argentina).­ There is another one here.

If you can precisely identify the species of cactus, please post a comment!

For more information about the Cardón Cactus, read: