BRITTON AND ROSE, VOL. I 



M. E. Eaton del 



1. Top of flowering stem of Cephalocerms brooksianus. 3. Top of stem of Cephalocereus phaeacanthus . 



2. Top of stem of Cepkalocereus catingicola. 4. Flowering branch of Leptocereus assurgens. 



(Natural size.) 



