[Britton N. L., Rose J. N., The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family. Volume III, Carnegie Institution of Washington, Washington, 1922, tom III, s. 107–109, 123–134, 143–146, 167–168, 173–174, 181–182]
The third volume of the historical cactus monograph, with descriptions of stems, areoles, spines, reproductive organs and localities, and examples from cultivation. The reading covers Leuchtenbergia, species now treated as Kroenleinia and Homalocephala, and Ferocactus and Glandulicactus. It also presents the protologues of Ferocactus horridus and F. townsendianus, older names of F. pilosus, variation in armature and observations of flower opening rhythms. The reading covers pages 107–109, 123–134, 143–146, 167–168, 173–174 and 181–182.