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:

argentine saguaro big blue sky cardon grande cactus cardón echinopsis atacamensis echinopsis terscheckii large noroeste argentino

Photos taken in Argentina in Februaty and March 2010.­

Related series:

- Bolivia