[Leuenberger B. E., Pereskia (Cactaceae), Memoirs of the New York Botanical Garden, The New York Botanical Garden, New York, 1986, tom 41, s. 1–141]
The monograph on leafy cacti presents descriptions of their structure, identification keys, habitat data and observations of living specimens. Its historical treatment includes taxa later transferred between Pereskia and Leuenbergeria, including plants described as Pereskia humboldtii and P. grandifolia var. violacea.