Phytoecology of the steppic formation at Drinn (Stipagrostis pungens) in the Naâma region (western Algeria). -The steppic plateaus of N-Africa are remarkably affected by silting up and desertification. Sanding favors the installation of psammophytic formations dominated by Stipagrostis pungens, Thymelaea microphylla and Retama raetam on sandy accumulations and wind deposits. The study focuses on the eco-floristic aspects of the psammophytic grassland steppe of Stipagrostis pengens in the Naâma

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... egion (W-Algeria). Its objective is to illustrate the current state and to describe the floristic settlement characteristic of a type of steppe grouping very widespread in the summit Oran plateaus. The Drinn-dominated grasslands (Stipagrostis pungens) can form a homogeneous steppe very adapted to drought, by physiological reactions, as well as by ecological strategies, facilitating their spreading. The Drinn is loosely distributed in large, dense, branched tufts, more than one meter high on sandy accumulations in an arid climate. Several parameters are studied to approach the quantitative and qualitative aspects of the floristic settlement. This is followed by a statistical approach, to better interpret the different results obtained. 51 plant species belonging to 14 botanical families and 37 genera of vascular plants have been identified. The results obtained show that the phytoecological inventories are an useful tool to assess and develop natural resources.