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[en] In order to safeguard and to improve the fodder species Hedysarum spinosissimum L subsp.capitatum (desf.) asch. et Gr., we estimated the heritability of certain morphological natures. The model used requires, as a preliminary, the analysis of the variance for the estimate of its components. Families of plants half-sibs, resulting from natural pollination, were analysed. The test of ANOVA shows that the familiy effect is significant for five agronomic characters: length of the principal axis(LO); Number of the secondary branches(NTP); (length of the longest secondary branch(LPL); Date of flowering(DF); Number of inflorescences(NIF). To support the idea of use of these variables in a breeding program, we estimated their heritability. The analysis of the significance of this genetic parameter shows that ultimately three characters only are significantly heritable. They are morphological markers NTP, LPL and which can be retained for any project of family's selection's at H. capitatum.