Oreocereus ritteri Oreocereus ritteri Cullmann in Kakteen And. Sukk. 9: 101. 1958 sec. Hunt 200611. Hunt, D.R. 2006: The New Cactus Lexicon. – Milborne Port: dh books=Oreocereus celsianus var. ritteri Krainz syn. sec. TROPICOS 1988+22. TROPICOS 1988+: Tropicos.org. Missouri Botanical Garden – https://tropicos.orgContent