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:

- en.wikipedia.org/wiki/Echinopsis_terscheckii

- es.wikipedia.org/wiki/Echinopsis_atacamensis.