Lophophora in Contr. U.S. Natl. Herb. 3: 131. 1894 sec. Vázquez-Sánchez & al. (2013)
- Type: Lophophora williamsii
Butterworth & al. (2002) found L. williamsii as sister to Obregonia and L. diffusa (Croizat) Bravo as sister to Acharagma, yet both with only moderate support. In contrast, Lophophora williamsii and L. diffusa were resolved as sisters with moderate support in the study of Vázquez-Sánchez & al. (2013), who also found high support for the sister relationship of Lophophora and Obregonia, justifying generic rank for both.