In the context of identifying the spontaneous forage species constituting a large part of the ruminant diet of the arid regions of Algeria; our research focused on the study of the floristic diversity of pasture rangelands in southeastern Algeria. The floristic surveys carried out in four grazing stations have made it possible to identify 28 plant species that belong to 16 families. This community is dominated by Poaceae, Asteraceae and Chenopodiaceae, all well adapted to the aridity of the environment. We show that during the study period, Astragalus armatus is the most dominant species, but because the region is subject to the utilization of pasture, the total density is low in the four stations from 0.2 to 0.3 plants / unit area. The principal components analysis (PCA) allowed us to separate the plant species into distinct homogeneous groups and allowed characterization of each sampling station. One of the major objectives of this study is to encourage scientists and land managers to think about the sustainable management of pastures.

Keywords: Animal feed, spontaneous flora, inventory, arid region.