Phaseolus lunatus is a legume rich in protein and essential amino acids, with a notable morphological diversity that influences its floral phenology. The aim of this study was to evaluate the flowering period of four morphotypes and to determine the duration of flower opening. The experiments were carried out at the Université Jean Lorougnon Guédé in Daloa, Côte d’Ivoire. The experimental set-up used was a complete block with 10 plants per morphotype. The results revealed significant variability between morphotypes. Morphotype 3 showed early flowering (79 days), while morphotype 2 was the latest (137 days). Analysis of floral morphology using an optical microscope revealed significant differences between morphotypes in terms of the number of flowers opened and aborted. This study underlines the importance of understanding floral phenology for optimizing P. lunatus production and guiding varietal selection. The variability observed highlights the potential for genetic improvement, in order to develop better-performing varieties that are better adapted to changing climatic conditions.
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