"DNA sequence studies... show that it stands alone, without definite affinity to any other group of cereoid cacti. In fact, Calymmanthium...Read More seems to be basal to the entire subfamily Cactoideae; it is therefore placed in its own tribe, the Calymmantheae. Friedrich Ritter discovered this unusual, arboreal cactus while exploring in northern Peru in 1954... few plants are found in collections or botanic gardens." (“The Cactus Family” by Edward F. Anderson (2001), pg. 137)
"DNA sequence studies... show that it stands alone, without definite affinity to any other group of cereoid cacti. In fact, Calymmanthium...Read More
Tall, columnar angular, usually three-sided Peruvian semi-tropical cactus- monotypic species