Aporocactus ×knebelii Aporocactus ×knebelii Knebel in Phyllokakteen: 60. 1931 sec. TPL 20131 wfo-0001430042≡Aporocactus knebelii Knebel in Phyllokakteen: 60. 1931 syn. sec. TPL 20131 wfo-00012899761. TPL 2013: The Plant List v. 1.1 – http://www.plantlist.org/.Content