The basement floor develops between sea level and 400 or 800 meters. This difference depends on the position to leeward, higher, or windward lower. It is characterized by the presence of a desert scrub species of the genus Euphorbia as the cactus and tabaiba. Is present in all the islands, but is dominant in Lanzarote and Fuerteventura. Near the coast are halophilic species such as sea lettuce, the cape gooseberry or evergreen sea. These species appear, particularly in the salt mines. In the sandy areas of the eastern islands are species adapted to this soil so poor, with plants Chenolea family. In all the islands are formations of salt cedar tamarisks and canary. This is the floor that has suffered a high human impact, which has displaced most of the natural species. Thus we find large areas of gorse and commercial orchards. Also long-grass prairie extended to cattle, but the impact of the tourist economy has caused the abandonment of these areas and allowed the emergence of opportunistic secondary species.
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