Praecereus euchlorus is a flowering plant in the family Cactaceae that is found in Brazil, Bolivia and Paraguay at elevations of 700 to 1300 meters[1] Praecereus euchlorus initially grows slightly upright, is less branched and later bent over and leaning in sympathy.

The much shorter edge spines have a length of 5 to 10 (rarely to 15) millimeters.

[2] Accepted Subspecies:[3] Praecereus euchlorus is found slopes on rocky outcrops in southern and western Brazil, Paraguay, Trinidad, Venezuela, Colombia, Ecuador, Peru, Bolivia, and northeast Argentina growing from sea level to 2000 meters.

[4] Originally described as Cereus euchlorus by Karl Moritz Schumann in 1897, its specific epithet derives from the Greek words "eu" (real) and "chloros" (green), referring to the plant's vibrant green shoots.

[5] In 1997, Nigel Paul Taylor reclassified the species into the genus Praecereus.