Abstract
Most contemporary studies of photoperiodism in plants have dealt with species which normally flower either in long or short day conditions. There is great experimental convenience and clarity of response in the employment of species which can be qualitatively distinguished as reproductive in a short photoperiod and vegetative in a long photoperiod or vice versa. Phenomenal improvement in our knowledge of the physiology of growth and reproduction has attended the study of such clearly defined types in the two decades following the enunciation of the basic concept of photoperiodism by Garner and Allard (8). Scientific interest has centered in the nature of the metabolic factors
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