the Ebro valley, which crosses southern Navarre, central Aragon and western Catalonia. It also is found in Madrid, Extremadura, Castilla-La Mancha, and some locations of western Andalusia. The dry season extends beyond the summer and average temperature depends on altitude and latitude. The oceanic climate (Cfb), located in the northern quarter of the country, especially in the Atlantic region (Basque Country, Cantabria, Asturias, and partly Galicia and Castile–León). Additionally it is also found in northern Navarre, in most highlands areas along the Iberian System and in the Pyrenean valleys, where a humid subtropical variant (Cfa) also occurs. Winter and summer temperatures are influenced by the ocean, and have no seasonal drought. Apart from these main types, other sub-types can be found, like the alpine climate in areas with very high altitude, the humid subtropical climate in areas of northeastern Spain and the continental climates (Dfc, Dfb / Dsc, Dsb) in the Pyrenees as well as parts of the Cantabrian Range, the Central System, Sierra Nevada and the Iberian System, and a typical desert climate (BWk, BWh) in the zone of Almería, Murcia and eastern Canary Islands. Low-lying areas of the Canary Islands average above during their coolest month, thus having a tropical climate. Fauna and flora The fauna presents a wide diversity that is due in large part to the geographical position of the Iberian peninsula between the Atlantic and the Mediterranean and between Africa and Eurasia, and the great diversity of habitats and biotopes, the result of a considerable variety of climates and well differentiated regions. The vegetation of Spain is varied due to several factors including the diversity of the terrain, the climate and latitude. Spain includes different phytogeographic regions, each with its own floral characteristics resulting largely from the interaction of climate, topography, soil type and fire, and biotic factors. The country had a 2019 Forest Landscape Integrity Index mean score of 4.23/10, ranking it 130th globally out of 172 countries. Within the European territory, Spain has the largest number of plant species (7,600 vascular plants) of all European countries. In Spain there are 17.804 billion trees and an average of 284 million more grow each year. Politics The constitutional history of Spain dates back to the constitution of 1812. In June 1976, Spain's new King Juan Carlos dismissed Carlos Arias Navarro and appointed the reformer Adolfo Suárez as Prime Minister. The resulting general election in 1977