Echinopsis smrziana, synonym Soehrensia smrziana, is a species of Echinopsis found in northwest Argentina.
Description Echinopsis smrziana grows solitary or often forms clumps, reaching up to in height and in diameter. Its shoots are spherical to cylindrical or columnar, fresh green to gray-green, and initially prostrate before becoming upright. They can be up to long and in diameter. The plant has eleven to 13 broad ribs. It has seven to 14 spines that are whitish to golden brown, thin, piercing, and needle-like to bristly. The central spine is usually single and up to long, while the radial spines are long.
White flowers appear near the top of the shoot and are long. The spherical, green-yellow fruits are very juicy and tear vertically, with a diameter of .
Taxonomy Curt Backeberg first described the species as Echinopsis smrziana in 1936, naming it after Czech gardener and cactus enthusiast Oskar Smrz. In 1959, the species was reclassified into the genus Soehrensia. , Plants of the World Online placed it in the genus Echinopsis.
Distribution Echinopsis smrziana is native to northwest Argentina. It is found in the Argentine province of Salta at altitudes of .
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