On the CITES Appendix II, the name of Harrisia jusbertii also appears. It is a cylindrical climbing cactus taxon, developing no adventitial roots. It is often used as grafting rootstock as stems are thicker than that of Selenicereus, and grows faster than Myrtillocactus. It was first described by Karl Schumann from the collection of Jusbert or Rebut in Argentina and Paraguay and from the Rebut’s naming (nomenclature) and catalog. Nevertheless, there are many taxonomical problems with this taxon. It is widely accepted that it has a hybrid origin. It rarely develops fruits as not self-compatible, but neither other Harrisia ‘Jusbertii’ plants can pollinate its flower. According to the observations of Duda, Harrisia ‘Jusberti’ pollen does not initiate even the development of seeds. Using Echinopsis pollen, the flowers can be fertilised. According to the observations made in the Botanical Garden of the Eötvös Loránd University, plants from this crossing are identical to the original Harrisia ‘Jusbertii’. Using Cleistocactus pollen, seed development also able to initiate, the offspring are, however, identical in morphological characters to Harrisia bomplandii. One may hypothesise that there are genetic combination which are lethal for the seeds. Nevertheless, there have been still may questions unresolved yet.
