ABSTRACT
In the last eighty years the physiology, ecology, and ecophysiology of desert plants have been studied intensively and in great detail by many authors. But nearly all of these investigations deal with water balance, photosynthesis, dry matter production, productivity, etc. The process and control of the flowering of desert plants has been largely neglected. One needs only to look through such old reviews of photoperiodism as, e.g., Lang, 38 Lockhart, 41 Naylor, 49 or recent ones like Vince-Prue 63 to see that there is not a single desert plant mentioned in their tables listing the photoperiodic reaction of a great number of plant species.
