About Praecereus euchlorus (F.A.C.Weber) N.P.Taylor
Praecereus euchlorus, previously described under the synonym Monvillea euchlora, begins growth slightly upright, with few branches, and later bends over to lean. Its slender shoots can reach up to 5 meters in length. It has 4 to 14 low, sharp-edged ribs. It produces up to 20 weak, whitish, needle-like thorns that are often very uneven in length. Up to 4 middle spines may be present, or may be absent entirely; these can reach up to 5 inches long, and rarely grow to 7.5 inches long. The shorter edge spines are between 5 and 10 millimeters long, and rarely reach 15 millimeters. The species bears white to greenish-white flowers that grow up to 8 centimeters long. The pericarpel and flower tube have very few scales, and are otherwise hairless. Its fruits are elongated. This cactus is found on slopes of rocky outcrops in southern and western Brazil, Bolivia, northeast Argentina, and Paraguay, growing at elevations from sea level up to 2000 meters.
