The study of the morphological difference of 628 leaves of the argan tree Argania spinosa (L.) Skeelswas carried out by subjective sampling after a period of field data collection in spring 2017 through thevarious wilayas: Mascara, Mostaganem, Algiers, Bechar, Adrar, Tindouf. The objective was a varietalidentification of foliage through the bioclimatic stages. However a measurement of two biometriccriteria (length and width) was carried out, which shows a differentiation of forms between the samplesstudied by the significant differentiation at which with a low correlation R² = 27.2%, the effect of climateon the shape of the leaves is noticeably well represented.