[1] Echinopsis clavatus grows shrubby, branches from the base and is more or less prostrate and creeping.

The club-shaped, dark green shoots are 1 to 2 meters long and have a diameter of 7 to 15 cm (2.8 to 5.9 in) with seven to ten blunt ribs that are notched.

The round areoles are densely covered with orange-brown wool and are 1.5 to 2.2 cm (0.59 to 0.87 in) apart.

[2] Echinopsis clavatus is widespread in the Bolivian department of La Paz at altitudes of 2500 to 3000 meters.

[3] The specific epithet clavatus comes from Latin, means 'club-shaped' and refers to the shape of the shoots.