Argentina - Serez Vella. Syn. Cereus baumannii, Cleistocactus flavispinus, Cereus baumanii var. flavispinus, Cleistocactus aureispinus, Cleistocactus jugatiflorus. Frost Toler. Hardy to -2 C. Min. Avg.Temp.10 C. Heat Tolerance: Light shade in hot climates in summer. Sun Exposure: Full sun. ...grown from seeds pollinated in habitat. These seedlings are about 1.5 years old. Viny cactus, columnar, basally clumping, stems up to 120 cm long, 3cm in diameter . C.baumannii is one of the most popular, easiest to grow species of Cleistocactus and has tubular, bright red flowers, some clones have white corolla. Their shape is suitable for pollination by hummingbirds. The pink fruit is edible without any special preparation. ...Subfamily Cactoideae, tribe Trichocereeae. The type species is C.baumannii. Cleistocactus is from South America, containing 48 species. In the recent years a number of genus have been regrouped in Cleistocactus, by ICSG. Species from these genera have been included: Akersia, Binghamia in part, Bolivicereus, Borzicactella, Borzicactus in part, Cleistanthocereus in part, Hildewintera, Loxanthocereus in part, Maritimocereus, Seticereus in part, Seticleistocactus, Winteria, Winterocereus. The name Cleistocactus comes from the Greek, kleistos, closed, referring narrow tubular flowers. The species that used to be in the genus Borzicactus have flowers that open wider.