Hatiora in L.H.Bailey, Standard Cycl. Hort.: 1432. 1915 sec. Korotkova & al. (2011)
- Type: Hatiora salicornioides
- =Pseudozygocactus in Blätt. Kakteenf. 1938(6): [5, 21]. 1938 syn. sec. Hunt (2006)
The circumscription of Hatiora has been clarified recently. Hatiora including Rhipsalidopsis as adopted by Barthlott (1987), Barthlott & Hunt (1993), Barthlott & Taylor (1995), Hunt (2006) and Nyffeler & Eggli (2010) was found to be polyphyletic (Calvente & al. 2011; Korotkova & al. 2011). Hatiora should therefore be restricted to species with cylindrical stems, terete pericarpels, and small yellow-orange or magenta flowers, corresponding to Hatiora in the traditional sense. Accordingly, Rhipsalidopsis in its traditional circumscription should again be accepted at generic rank.