×Schlumbergeranthus exoticus (Barthlott & Rauh) Doweld in Sukkulenty 4(1-2): 43. 2002 ["2001"] ×Schlumbergeranthus exoticus (Barthlott & Rauh) Doweld in Sukkulenty 4(1-2): 43. 2002 ["2001"]Taxon for this name×Schlumbergeranthus exoticus (Barthlott & Rauh) Doweld