Not type material. Specimen is (presumably) clonotype material of Cleistocactus buchtienii var. flavispinus Cárdenas; specimen made from cultivated material of Cárdenas 4820a (=type of Cleistocactus buchtienii var. flavispinus Cárdenas, orig. Angostura, Cochabamba, Bolivia) at University of California Botanical Garden, Berkeley, California.