The invention relates to an extract of flowers, preferably calyxes, from kapok trees, in particular Bombax costatum, to a process for preparing same and to the extract obtainable by said process. The invention also relates to a composition comprising such an extract, the composition being advantageously a cosmetic, pharmaceutical or dermatological composition. The invention also relates to such a composition or such an extract for use in preventing or treating disorders or diseases of the skin, the mucous membranes or keratinous appendages and for use in preventing or treating vascular disorders. The invention finally relates to a cosmetic care process for the skin, the keratinous appendages or the mucous membranes, with a view to improving the condition thereof or the appearance thereof, which process consists in administering such a composition or such an extract.