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Research on the floristic The Saharan Atlas Bechar was undertaken. The Saharan Atlas covers important plant resources spread over the plains, mountains, chotts the Dayas and desert areas.

Their potential for biological resources and their impressive diversity across the country imperatively require a preservation strategy is developed. Ratification by Algeria, the Convention on Biological Diversity is an important step in the management of this valuable capital and an irrefutable proof which strengthens the position of our country in the conservation of biological diversity across planetary and in building sustainable development.

Our work is part of an overall framework that aims the preservation of plant species such as the case of the Atlas Pistachio (Pistacia atlantica Desf.) are currently the object of our concern.

It is a very special forest heritage since it is an interesting species in many ways. The Pistachio Atlas is a large powerful xeric very special tree trunk up to ten meters high.

The approach used consisted of floristic inventory from phytoecological identified in the pistachio range. The 50 surveys are conducted and 127 species (woody and herbaceous) belonging to 97genres grouped into 36 families were inventoried.

The Pistacia atlantica is a promising species for Western Algeria, its adaptation to environmental stresses enables a dynamic and some biological recovery. Floristic diversity of the group to Pistacia atlantica is very special because of its biological characterization, systematic and phytogeographical. This review highlights the importance of endemic species-Saharan Africa through adaptation and resistance under more favorable typically Saharan bioclimate. (C) 2015 The Authors. Published by Elsevier Ltd.